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Your search keyword '"Kao, C. C."' showing total 6 results
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6 results on '"Kao, C. C."'

1. X-ray magnetic circular dichroism and resonant inelastic X-ray scattering explained: role of many-body correlation and mixed-valence fluctuations

Author

Kim, Beom Hyun, Lee, Sang-Jun, Huang, H., Lu, D., Hong, S. S., Lee, S., Abbamonte, P., Joe, Y. I., Szypryt, P., Doriese, W. B., Swetz, D. S., Ullom, J. N., Kao, C. -C., Lee, J. -S., and Kim, Bongjae

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

X-ray magnetic circular dichroism (XMCD) and resonant inelastic X-ray scattering with magnetic circular dichroism (RIXS-MCD) provide unparalleled insights into the electronic and magnetic dynamics of complex materials. Yet, their spectra remain challenging to interpret due to intricate many-body interactions. Here, we introduce a theoretical framework based on the Anderson impurity model, fully incorporating charge transfer (CT) and core-valence exchange correlation (CVEC) effects. Using epitaxial ferromagnetic La0.7Sr0.3MnO3 film as a model system, we capture elusive spectral features, demonstrating the necessity of CT inclusion for resolving XMCD subpeaks and revealing the profound impact of CVEC on RIXS-MCD spectra. Our approach not only successfully mirrors experimental results but also opens new avenues for exploring spin, orbital, and charge excitations in 3d transition metals and other correlated materials.

Published
2024

2. Characterization of photoinduced normal state through charge density wave in superconducting YBa$_2$Cu$_3$O$_{6.67}$

Author

Jang, H., Song, S., Kihara, T., Liu, Y., Lee, S. -J., Park, S. -Y., Kim, M., Kim, H. -D., Coslovich, G., Nakata, S., Kubota, Y., Inoue, I., Tamasaku, K., Yabashi, M., Lee, H., Song, C., Nojiri, H., Keimer, B., Kao, C. -C., and Lee, J. -S.

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

The normal state of high-Tc cuprates has been considered one of the essential topics in high-temperature superconductivity research. However, compared to the high magnetic fields study of it, understanding a photoinduced normal state remains elusive. Here, we explore a photoinduced normal state of YBa$_2$Cu$_3$O$_{6.67}$ (YBCO) through a charge density wave (CDW) with time-resolved resonant soft x-ray scattering, as well as a high-magnetic field x-ray scattering. In the non-equilibrium state in which people predict a quenched superconducting state based on the previous optical spectroscopies, we experimentally observed a similar analogy to the competition between superconductivity and CDW shown in the equilibrium state. We further observe that the broken pairing states in the superconducting CuO$_2$ plane via the optical pump lead to nucleation of three-dimensional CDW precursor correlation, revealing that the photoinduced CDW is similar to phenomena shown under magnetic fields. Ultimately, these findings provide a critical clue that the characteristics of the photoinduced normal state show a solid resemblance to those under magnetic fields in equilibrium conditions., Comment: 22 pages, 5 figures and Supplementary Materials with 6 pages, 9 figures

Published
2022
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6. Enhanced charge density wave with mobile superconducting vortices in La1.885Sr0.115CuO4.

Author

Wen, J.-J., He, W., Jang, H., Nojiri, H., Matsuzawa, S., Song, S., Chollet, M., Zhu, D., Liu, Y.-J., Fujita, M., Jiang, J. M., Rotundu, C. R., Kao, C.-C., Jiang, H.-C., Lee, J.-S., and Lee, Y. S.

Subjects
CHARGE density waves, MAGNETIC field effects, SPIN waves, CUPRATES, SUPERCONDUCTIVITY, MAGNETIC fields, X-ray scattering
Abstract

Superconductivity in the cuprates is found to be intertwined with charge and spin density waves. Determining the interactions between the different types of order is crucial for understanding these important materials. Here, we elucidate the role of the charge density wave (CDW) in the prototypical cuprate La1.885Sr0.115CuO4, by studying the effects of large magnetic fields (H) up to 24 Tesla. At low temperatures (T), the observed CDW peaks reveal two distinct regions in the material: a majority phase with short-range CDW coexisting with superconductivity, and a minority phase with longer-range CDW coexisting with static spin density wave (SDW). With increasing magnetic field, the CDW first grows smoothly in a manner similar to the SDW. However, at high fields we discover a sudden increase in the CDW amplitude upon entering the vortex-liquid state. Our results signify strong coupling of the CDW to mobile superconducting vortices and link enhanced CDW amplitude with local superconducting pairing across the H − T phase diagram. Superconductivity in the cuprates is known to be intertwined with charge and spin density waves. Here, the authors study the prototypical cuprate La1.885Sr0.115CuO4 via x-ray scattering and discover a sudden increase in the charge-density-wave amplitude upon entering the superconducting-vortex-liquid state at high magnetic field. [ABSTRACT FROM AUTHOR]

Published
2023
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