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6. 3 Blue Ruin

Author

Williams, Travis

Published
2022

8. Contents

Author

Williams, Travis

Published
2022

10. Back Cover

Author

Williams, Travis

Published
2022

11. Dedication

Author

Williams, Travis

Published
2022

15. Preface

Author

Williams, Travis

Published
2022

24. Incipient nematicity from electron flat bands in a kagome metal

Author

Drucker, Nathan, Nguyen, Thanh, Mandal, Manasi, Siriviboon, Phum, Quan, Yujie, Boonkird, Artittaya, Okabe, Ryotaro, Li, Fankang, Buragge, Kaleb, Funuma, Fumiaki, Matsuda, Masaaki, Abernathy, Douglas, Williams, Travis, Chi, Songxue, Ye, Feng, Nelson, Christie, Liao, Bolin, Volkov, Pavel, and Li, Mingda

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Engineering new quantum phases requires fine tuning of the electronic, orbital, spin, and lattice degrees of freedom. To this end, the kagome lattice with flat bands has garnered great attention by hosting various topological and correlated phases, when the flat band is at the Fermi level. Here we discover unconventional nematiciy in kagome metal CoSn, where flat bands are fully occupied below the Fermi level. Thermodynamic, dilatometry, resonant X-ray scattering, inelastic neutron scattering, Larmor diffraction, and thermoelectric measurements consistently hint at rotational symmetry-breaking and nematic order that is pronounced only near T=225 K. These observations, principally the nematic's finite temperature stability -- incipience -- can be explained by a phenomenological model which reveals that thermally excited flat bands promote symmetry breaking at a characteristic temperature. Our work shows that thermal fluctuations, which are typically detrimental for correlated electron phases, can induce new ordered states of matter, avoiding the requirements for fine tuning of electronic bands., Comment: 37 pages, 5 main figures, 14 supplementary figures

Published
2024

25. Monte-Carlo ray-tracing studies of multiplexed prismatic graphite analyzers for the cold-neutron triple-axis spectrometer at the High Flux Isotope Reactor

Author

Desai, Adit S., Williams, Travis J., Daum, Marcus, Sala, Gabriele, Aczel, Adam A., Granroth, Garrett E., and Mourigal, Martin

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

A modern cold triple-axis spectrometer to study quantum condensed matter systems is planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the conceptual principles and design of a secondary spectrometer using a multiplexed, prismatic analyzer system relying on graphite crystals and inspired by the successful implementation of the Continuous Angle Multiple Energy Analysis (CAMEA) spectrometers at the Paul Scherrer Institute. This project is currently known as MANTA for Multi-analyzer Neutron Triple-Axis. We report Monte-Carlo ray-tracing simulations on a simple but realistic sample scattering kernel to further illustrate the prismatic analyzer concept's workings, calibration, and performance. Then, we introduce a new statistical analysis approach based on the prismatic analyzer concept to improve the number of final energies measured on the spectrometer. We also study possible evolutions in the CAMEA design relevant for MANTA., Comment: 11 pages, 11 figures

Published
2023
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30. SEEMS: A Single Event Effects and Muon Spectroscopy facility at the Spallation Neutron Source

Author

Williams, Travis J., MacDougall, Gregory J., Riemer, Bernie W., Gallmeier, Franz X., Cruz, Clarina R. dela, and Louca, Despina

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science
Abstract

This manuscript outlines a concept that would leverage the existing proton accelerator at the Spallation Neutron Source of Oak Ridge National Laboratory to enable transformative science via one world-class facility serving two missions: Single Event Effects (SEE) and Muon Spectroscopy ($\mu$SR). The $\mu$SR portion would deliver the world's highest flux and highest resolution pulsed muon beams for materials characterization purposes, with precision and capabilities well beyond comparable facilities. The SEE capabilities deliver neutron, proton and muon beams for aerospace industries that are facing an impending challenge to certify equipment for safe and reliable behavior under bombardment from atmospheric radiation originating from cosmic and solar rays. With negligible impact on the primary neutron scattering mission of the SNS, the proposed facility will have enormous benefit for science and industry alike. We have designated this facility 'SEEMS'., Comment: 11 pages, 7 figures, to be published in Review of Scientific Instruments

Published
2022
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31. Understanding temperature-dependent SU($3$) spin dynamics in the $S=1$ antiferromagnet Ba$_2$FeSi$_2$O$_7$

Author

Do, Seung-Hwan, Zhang, Hao, Dahlbom, David A., Williams, Travis J., Garlea, V. Ovidiu, Hong, Tao, Jang, Tae-Hwan, Cheong, Sang-Wook, Park, Jae-Hoon, Barros, Kipton, Batista, Cristian D., and Christianson, Andrew D.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

Quantum magnets admit more than one classical limit and $N$-level systems with strong single-ion anisotropy are expected to be described by a classical approximation based on SU($N$) coherent states. Here we test this hypothesis by modeling finite temperature inelastic neutron scattering (INS) data of the effective spin-one antiferromagnet \bfso{}. The measured dynamic structure factor is calculated with a generalized Landau-Lifshitz dynamics for SU($3$) spins. Unlike the traditional classical limit based on SU($2$) coherent states, the results obtained with classical SU($3$) spins are in good agreement with the measured temperature-dependent spectrum. The SU($3$) approach developed here provides a general framework to understand the broad class of materials comprising weakly coupled antiferromagnetic dimers, trimers, or tetramers, and magnets with strong single-ion anisotropy., Comment: 8 pages 4 figures

Published
2022

32. Magnetic Field Tuning of Parallel Spin Stripe Order and Fluctuations near the Pseudogap Quantum Critical Point in La$_{1.36}$Nd$_{0.4}$Sr$_{0.24}$CuO$_4$

Author

Ma, Qianli, Smith, Evan M., Cronkwright, Zachary W., Dragomir, Mirela, Mitchell, Gabrielle, Winn, Barry W., Williams, Travis J., and Gaulin, Bruce D.

Subjects
Condensed Matter - Superconductivity
Abstract

A quantum critical point in the single layer, hole-doped cuprate system La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ (Nd-LSCO), near $x$ = 0.23 has been proposed as an organizing principle for understanding high temperature superconductivity. Our earlier neutron diffraction work on Nd-LSCO at optimal and high doping revealed static parallel spin stripes to exist out to the QCP and slightly beyond, at $x$ = 0.24 and 0.26. We examine more closely the parallel spin stripe order parameter in Nd-LSCO in both zero magnetic field and fields up to 8 T for H // c in these single crystals. In contrast to earlier studies at lower doping, we observe that H //c in excess of $\sim$ 2.5 T eliminates the incommensurate quasi-Bragg peaks associated with parallel spin stripes. But this elastic scattering is not destroyed by the field; rather it is transferred to commensurate {\textbf{Q} = 0} Bragg positions, implying that the spins participating in the spin stripes have been polarized. Inelastic neutron scattering measurements at high fields show an increase in the low energy, parallel spin stripe fluctuations and evidence for a spin gap, $\Delta_{spin}$= 3 $\pm$ 0.5 meV for Nd-LSCO with $x$ = 0.24. This is shown to be consistent with spin gap measurements as a function of superconducting T$_C$ over five different families of cuprate superconductors, which follow the approximate linear relation, $\Delta_{spin}$ = 3.5 k$_B$T$_C$.

Published
2022
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33. Gaps in Topological Magnon Spectra: Intrinsic vs. Extrinsic Effects

Author

Do, Seung-Hwan, Paddison, Joseph A. M., Sala, Gabriele, Williams, Travis J., Kaneko, Koji, Kuwahara, Keitaro, May, A. F., Yan, Jiaqiang, McGuire, Michael A., Stone, Matthew B., Lumsden, Mark D., and Christianson, Andrew D.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

For topological magnon spectra, determining and explaining the presence of a gap at a magnon crossing point is a key to characterize the topological properties of the system. An inelastic neutron scattering study of a single crystal is a powerful experimental technique that is widely employed to probe the magnetic excitation spectra of topological materials. Here, we show that when the scattering intensity rapidly disperses in the vicinity of a crossing point, such as a Dirac point, the apparent topological gap size is extremely sensitive to experimental conditions including sample mosaic, resolution, and momentum integration range. We demonstrate these effects using comprehensive neutron-scattering measurements of CrCl$_3$. Our measurements confirm the gapless nature of the Dirac magnon in CrCl$_3$, but also reveal an artificial, i.e. extrinsic, magnon gap unless the momentum integration range is carefully controlled. Our study provides an explanation of the apparent discrepancies between spectroscopic and first-principles estimates of Dirac magnon gap sizes, and provides guidelines for accurate spectroscopic measurement of topological magnon gaps., Comment: 6 pages and 4 figures

Published
2022
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36. Antiferromagnetic fluctuations and orbital-selective Mott transition in the van der Waals ferromagnet Fe3-xGeTe2

Author

Bai, Xiaojian, Lechermann, Frank, Liu, Yaohua, Cheng, Yongqiang, Kolesnikov, Alexander I., Ye, Feng, Williams, Travis J., Chi, Songxue, Hong, Tao, Granroth, Garrett E., May, Andrew F., and Calder, Stuart

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

Fe3-xGeTe2 is a layered magnetic van der Waals material of interest for both fundamental and applied research. Despite the observation of intriguing physical properties, open questions exist even on the basic features related to magnetism: is it a simple ferromagnet or are there antiferromagnetic regimes and are the moments local or itinerant. Here, we demonstrate that antiferromagnetic spin fluctuations coexist with the ferromagnetism through comprehensive elastic and inelastic neutron scattering and thermodynamic measurements. Our realistic dynamical mean-field theory calculations reveal that the competing magnetic fluctuations are driven by an orbital selective Mott transition, where only the plane-perpendicular a1g orbital of the Fe(3d) manifold remains itinerant. Our results highlight the multi-orbital character in Fe3-xGeTe2 that supports a rare coexistence of local and itinerant physics within this material., Comment: 16 pages, 3 main figures

Published
2022
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40. US Muon Workshop 2021: A road map for a future Muon Facility

Author

Louca, Despina, MacDougall, Gregory J., and Williams, Travis J.

Subjects
Physics - Instrumentation and Detectors
Abstract

The workshop titled "US Muon Workshop 2021: A road map for a future Muon Facility" was held virtually on February 1-2, 2021. The workshop aimed to bring together world experts in muon spectroscopy ($\mu$SR) and other techniques along with interested stakeholders to evaluate the scientific need to construct a new $\mu$SR facility in the United States (US). The more than 200 participants highlighted several key scientific areas for $\mu$SR research, including quantum materials, hydrogen chemistry, and battery materials, and how each area could benefit from a new, high flux pulsed muon source. Experts also discussed aspects of the $\mu$SR technique, such as low-energy $mu$SR, novel software developments, and beam and detector technologies that could enable revolutionary advances in $\mu$SR at a next-generation facility. The workshop concluded with discussion of a concept being developed for a new $\mu$SR facility at the Spallation Neutron Source (SNS) of Oak Ridge National Laboratory (ORNL). That novel design concept was first envisioned by many of the same $\mu$SR experts at a workshop held previously at ORNL in 2016. The participants expressed that the current design had the potential to be a world-leading $\mu$SR facility, and strongly encouraged the principal investigators to continue their work in order to refine the concept and determine instrument parameters that would enable new scientific opportunities.

Published
2021
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42. Puerto Rico Grid Resilience and Transitions to 100% Renewable Energy Study (PR100): Final Report

Author

Baggu, Murali, primary, Burton, Robin, additional, Blair, Nate, additional, Sengupta, Manajit, additional, Harris, Tom, additional, Barrows, Clayton, additional, Sky, Haiku, additional, Gevorgian, Vahan, additional, Keen, Jeremy, additional, Smith, Elena, additional, Campton, Mike, additional, Jena, Sushmita, additional, Yang, Jaemo, additional, Williams, Travis, additional, Das, Paritosh, additional, Elsworth, James, additional, Joshi, Prateek, additional, Weiner, Cameron, additional, Morris, James, additional, McKinsey, Joseph, additional, Dhulipala, Surya Chandan, additional, Molnar, Sam, additional, Yan, Weihang, additional, Sharma, Pranav, additional, Wang, Wenbo, additional, Latif, Aadil, additional, Thom, Daniel, additional, Dalvi, Sourabh, additional, Baring-Gould, Ian, additional, Lave, Matthew, additional, Wachtel, Amanda, additional, Jones, C. Birk, additional, Moog, Emily, additional, Mammoli, Andrea, additional, Garrett, Richard, additional, Haines, Thad, additional, Vining, Will, additional, Newlun, Cody, additional, Hart, Olga, additional, Elizondo, Marcelo, additional, Fan, Xiaoyuan, additional, Maloney, Patrick, additional, Bharati, Alok, additional, Vyakaranam, Bharat, additional, Chalishazar, Vishvas, additional, Royer, Patrick, additional, Bereta dos Reis, Fernando, additional, Li, Xue (Michelle), additional, Mahapatra, Kaveri, additional, Dagle, Jeff, additional, Ke, Xinda, additional, Zhao, Meng, additional, Vasios, Orestis, additional, Franklin, Tycko, additional, Abdelmalak, Michael, additional, Guddanti, Kishan, additional, Acharya, Samrat, additional, Cruz, Marcos, additional, Etingov, Pavel, additional, Qin, Chuan, additional, Bedoya, Juan Carlos, additional, Nguyen, Tony, additional, Bhadra, Sraddhanjoli, additional, Tbaileh, Ahmad, additional, Ward, Laura, additional, Sinnott, Victoria, additional, Mendez-Curbelo, Pablo, additional, Cappers, Peter, additional, Deason, Jeff, additional, Pigman, Margaret, additional, Lewis, Lawrence Paul, additional, Murphy, John T., additional, Kobayashi-Carvalhaes, Tomaz, additional, Bennett, Melanie, additional, Liu, Yilu, additional, Cutler, Harvey, additional, Shields, Martin, additional, Jeon, Hwayoung, additional, and Chait, Michele, additional

Published
2024
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43. El Estudio de Resiliencia de la Red Electrica de Puerto Rico y Transiciones a Energia 100% Renovable (PR100): Informe Final

Author

Baggu, Murali, primary, Burton, Robin, additional, Blair, Nate, additional, Sengupta, Manajit, additional, Harris, Tom, additional, Barrows, Clayton, additional, Sky, Haiku, additional, Gevorgian, Vahan, additional, Keen, Jeremy, additional, Smith, Elena, additional, Campton, Mike, additional, Jena, Sushmita, additional, Yang, Jaemo, additional, Williams, Travis, additional, Das, Paritosh, additional, Elsworth, James, additional, Joshi, Prateek, additional, Weiner, Cameron, additional, Morris, James, additional, McKinsey, Joseph, additional, Dhulipala, Surya Chandan, additional, Molnar, Sam, additional, Yan, Weihang, additional, Sharma, Pranav, additional, Wang, Wenbo, additional, Latif, Aadil, additional, Thom, Daniel, additional, Dalvi, Sourabh, additional, Baring-Gould, Ian, additional, Lave, Matthew, additional, Wachtel, Amanda, additional, Jones, C. Birk, additional, Moog, Emily, additional, Mammoli, Andrea, additional, Garrett, Richard, additional, Haines, Thad, additional, Vining, Will, additional, Newlun, Cody, additional, Hart, Olga, additional, Elizondo, Marcelo, additional, Fan, Xiaoyuan, additional, Maloney, Patrick, additional, Bharati, Alok, additional, Vyakaranam, Bharat, additional, Chalishazar, Vishvas, additional, Royer, Patrick, additional, Bereta dos Reis, Fernando, additional, Li, Xue (Michelle), additional, Mahapatra, Kaveri, additional, Dagle, Jeff, additional, Ke, Xinda, additional, Zhao, Meng, additional, Vasios, Orestis, additional, Franklin, Tycko, additional, Abdelmalak, Michael, additional, Guddanti, Kishan, additional, Acharya, Samrat, additional, Cruz, Marcos, additional, Etingov, Pavel, additional, Qin, Chuan, additional, Bedoya, Juan Carlos, additional, Nguyen, Tony, additional, Bhadra, Sraddhanjoli, additional, Tbaileh, Ahmad, additional, Ward, Laura, additional, Sinnott, Victoria, additional, Mendez-Curbelo, Pablo, additional, Cappers, Peter, additional, Deason, Jeff, additional, Pigman, Margaret, additional, Lewis, Lawrence Paul, additional, Murphy, John T., additional, Kobayashi-Carvalhaes, Thomaz, additional, Bennett, Melanie, additional, Liu, Yilu, additional, Cutler, Harvey, additional, Shields, Martin, additional, Jeon, Hwayoung, additional, and Chait, Michele, additional

Published
2024
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44. Estudio de Resiliencia de la Red Electrica de Puerto Rico y Transiciones a Energia 100% Renovable (PR100): Informe resumido [Spanish Translation of Puerto Rico Grid Resilience and Transitions to 100% Renewable Energy Study (PR100) (Summary Report)]

Author

Baggu, Murali, primary, Burton, Robin, additional, Blair, Nate, additional, Sengupta, Manajit, additional, Harris, Tom, additional, Barrows, Clayton, additional, Sky, Haiku, additional, Gevorgian, Vahan, additional, Keen, Jeremy, additional, Smith, Elena, additional, Campton, Mike, additional, Jena, Sushmita, additional, Yang, Jaemo, additional, Williams, Travis, additional, Das, Paritosh, additional, Elsworth, James, additional, Joshi, Prateek, additional, Weiner, Cameron, additional, Morris, James, additional, McKinsey, Joseph, additional, Dhulipala, Surya Chandan, additional, Molnar, Sam, additional, Yan, Weihang, additional, Sharma, Pranav, additional, Wang, Wenbo, additional, Latif, Aadil, additional, Thom, Daniel, additional, Dalvi, Sourabh, additional, Baring-Gould, Ian, additional, Lave, Matthew, additional, Wachtel, Amanda, additional, Jones, C. Birk, additional, Moog, Emily, additional, Mammoli, Andrea, additional, Garrett, Richard, additional, Haines, Thad, additional, Vining, Will, additional, Newlun, Cody, additional, Hart, Olga, additional, Elizondo, Marcelo, additional, Fan, Xiaoyuan, additional, Maloney, Patrick, additional, Bharati, Alok, additional, Vyakaranam, Bharat, additional, Chalishazar, Vishvas, additional, Royer, Patrick, additional, Bereta dos Reis, Fernando, additional, Li, Xue (Michelle), additional, Mahapatra, Kaveri, additional, Dagle, Jeff, additional, Ke, Xinda, additional, Zhao, Meng, additional, Vasios, Orestis, additional, Franklin, Tycko, additional, Abdelmalak, Michael, additional, Guddanti, Kishan, additional, Acharya, Samrat, additional, Cruz, Marcos, additional, Etingov, Pavel, additional, Qin, Chuan, additional, Bedoya, Juan, additional, Nguyen, Tony, additional, Bhadra, Sraddhanjoli, additional, Tbaileh, Ahmad, additional, Ward, Laura, additional, Sinnott, Victoria, additional, Mendez-Curbelo, Pablo, additional, Cappers, Peter, additional, Deason, Jeff, additional, Pigman, Margaret, additional, Lewis, Lawrence, additional, Murphy, John, additional, Kobayashi-Carvalhaes, Thomaz, additional, Bennett, Melanie, additional, Liu, Yilu, additional, Cutler, Harvey, additional, Shields, Martin, additional, Jeon, Hwayoung, additional, and Chait, Michele, additional

Published
2024
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45. Puerto Rico Grid Resilience and Transitions to 100% Renewable Energy Study (PR100) (Summary Report)

Author

Baggu, Murali, primary, Burton, Robin, additional, Blair, Nate, additional, Sengupta, Manajit, additional, Harris, Tom, additional, Barrows, Clayton, additional, Sky, Haiku, additional, Gevorgian, Vahan, additional, Keen, Jeremy, additional, Smith, Elena, additional, Campton, Mike, additional, Jena, Sushmita, additional, Yang, Jaemo, additional, Williams, Travis, additional, Das, Paritosh, additional, Elsworth, James, additional, Joshi, Prateek, additional, Weiner, Cameron, additional, Morris, James, additional, McKinsey, Joseph, additional, Dhulipala, Surya, additional, Molnar, Sam, additional, Yan, Weihang, additional, Sharma, Pranav, additional, Wang, Wenbo, additional, Latif, Aadil, additional, Thom, Daniel, additional, Dalvi, Sourabh, additional, Baring-Gould, Ian, additional, Lave, Matthew, additional, Wachtel, Amanda, additional, Jones, C., additional, Moog, Emily, additional, Mammoli, Andrea, additional, Garrett, Richard, additional, Haines, Thad, additional, Vining, Will, additional, Newlun, Cody, additional, Hart, Olga, additional, Elizondo, Marcelo, additional, Fan, Xiaoyuan, additional, Maloney, Patrick, additional, Bharati, Alok, additional, Vyakaranam, Bharat, additional, Chalishazar, Vishvas, additional, Royer, Patrick, additional, Bereta dos Reis, Fernando, additional, Li, Xue, additional, Mahapatra, Kaveri, additional, Dagle, Jeff, additional, Ke, Xinda, additional, Zhao, Meng, additional, Vasios, Orestis, additional, Franklin, Tycko, additional, Abdelmalak, Michael, additional, Guddanti, Kishan, additional, Acharya, Samrat, additional, Cruz, Marcos, additional, Etingov, Pavel, additional, Qin, Chuan, additional, Bedoya, Juan, additional, Nguyen, Tony, additional, Bhadra, Sraddhanjoli, additional, Tbaileh, Ahmad, additional, Ward, Laura, additional, Sinnott, Victoria, additional, Mendez-Curbelo, Pablo, additional, Cappers, Peter, additional, Deason, Jeff, additional, Pigman, Margaret, additional, Lewis, Lawrence, additional, Murphy, John, additional, Kobayashi-Carvalhaes, Thomaz, additional, Bennett, Melanie, additional, Liu, Yilu, additional, Cutler, Harvey, additional, Shields, Martin, additional, Jeon, Hwayoung, additional, and Chait, Michele, additional

Published
2024
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47. Solar Photovoltaics and Land-Based Wind Technical Potential and Supply Curves for the Contiguous United States (2023 Edition)

Author

Lopez, Anthony, primary, Pinchuk, Pavlo, additional, Gleason, Michael, additional, Cole, Wesley, additional, Mai, Trieu, additional, Williams, Travis, additional, Roberts, Owen, additional, Rivers, Marie, additional, Bannister, Mike, additional, Thomson, Sophie-Min, additional, Zuckerman, Gabe, additional, and Sergi, Brian, additional

Published
2024
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49. Topology stabilized fluctuations in a magnetic nodal semimetal

Author

Drucker, Nathan C., Nguyen, Thanh, Han, Fei, Siriviboon, Phum, Luo, Xi, Andrejevic, Nina, Zhu, Ziming, Bednik, Grigory, Nguyen, Quynh T., Chen, Zhantao, Nguyen, Linh K., Liu, Tongtong, Williams, Travis J., Stone, Matthew B., Kolesnikov, Alexander I., Chi, Songxue, Fernandez-Baca, Jaime, Nelson, Christie S., Alatas, Ahmet, Hogan, Tom, Puretzky, Alexander A., Huang, Shengxi, Yu, Yue, and Li, Mingda

Published
2023
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