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3,173 results on '"Sharma, Jyoti"'

13. Validating Mean Field Theory in a New Complex, Disordered High-Entropy Spinel Oxide

Author

Sharma, Neha, Sharma, Nikita, Sharma, Jyoti, Kaushik, S. D., Mahatha, Sanjoy Kr., Chakraborty, Tirthankar, and Marik, Sourav

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The advent of novel high-entropy oxides has sparked substantial research interest due to their exceptional functional properties, which often surpass the mere sum of their constituent elements' characteristics. This study introduces a complex high-entropy spinel oxide with composition (Ni$_{0.2}$Mg$_{0.2}$Co$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$)(Mn$_{0.66}$Fe$_{0.66}$Cr$_{0.66}$)O$_{4}$. We performed comprehensive structural (X-ray and Neutron diffraction), microstructural, magnetic, and local electronic structure investigations on this material. Despite the material's high degree of disorder, detailed magnetization measurements and low temperature neutron powder diffraction studies reveal long-range ferrimagnetic ordering beginning at 293 K. The sample exhibits a high saturation magnetization of 766 emu-cm${^3}$ (at 50 K), a low coercivity (H$_C$) of 100 Oe (50 K), a high transition temperature (T$_C$) around room temperature, and high resistivity value of 4000 Ohm-cm at room temperature, indicating its potential for high density memory devices. The magnetic structure is determined using a collinear-type ferrimagnetic model with a propagation vector k = 0,0,0. Various analytical techniques, including modified Arrott plots, Kouvel-Fischer analysis, and critical isotherm analysis, are employed to investigate the phase transitions and magnetic properties of this complex system. Our results indicate a second-order phase transition. Remarkably, despite the complex structure and significant disorder, the critical exponents obtained are consistent with the mean field model. The high entropy leads to a remarkably homogeneous distribution of multiple cations, validating the approximation of average local magnetic environments and supporting the mean field theory.

Published
2024

17. The Role of Psychosocial Stress on Cardiovascular Disease in Women: JACC State-of-the-Art Review.

Author

Ebong, Imo, Quesada, Odayme, Fonkoue, Ida, Mattina, Deirdre, Sullivan, Samaah, Oliveira, Glaucia, Spikes, Telisa, Sharma, Jyoti, Commodore, Yvonne, Ogunniyi, Modele, Aggarwal, Niti, and Vaccarino, Viola

Subjects
cardiovascular disease, coronary heart disease, mental stress, psychosocial stress, women, Humans, Stress, Psychological, Female, Cardiovascular Diseases, Womens Health
Abstract

Psychosocial stress can affect cardiovascular health through multiple pathways. Certain stressors, such as socioeconomic disadvantage, childhood adversity, intimate partner violence, and caregiving stress, are especially common among women. The consequences of stress begin at a young age and persist throughout the life course. This is especially true for women, among whom the burden of negative psychosocial experiences tends to be larger in young age and midlife. Menarche, pregnancy, and menopause can further exacerbate stress in vulnerable women. Not only is psychosocial adversity prevalent in women, but it could have more pronounced consequences for cardiovascular risk among women than among men. These differential effects could reside in sex differences in responses to stress, combined with womens propensity toward vasomotor reactivity, microvascular dysfunction, and inflammation. The bulk of evidence suggests that targeting stress could be an important strategy for cardiovascular risk reduction in women.

Published
2024

18. Structural, magnetic and x-ray absorption spectroscopy studies of new Cr-based low, medium and high-entropy spinel oxides

Author

Mandal, Sushanta, Sharma, Jyoti, Chakraborty, Tirthankar, Mahatha, Sanjoy Kr., and Marik, Sourav

Subjects
Condensed Matter - Materials Science
Abstract

The emergence of high-entropy oxides has spurred significant research interest in recent times. These compounds exhibit exotic functional properties that often transcend simple linear combinations of their constituent elements. Herein, we present a new series of Cr-based low, medium, and high entropy spinel oxides with composition NiCr2O4, [Ni0.5Mn0.5]Cr2O4, [Ni0.33Mn0.33Co0.33]Cr2O4, [Ni0.25Mn0.25Co0.25Cu0.25]Cr2O4, [Ni0.2Mn0.2Co0.2Cu0.2Zn0.2]Cr2O4, and [Ni0.2Mg0.2Co0.2Cu0.2Zn0.2]Cr2O4. We conducted detailed structural (X-ray and Neutron diffraction), microstructural, Raman spectroscopy, magnetic, and X-ray absorption spectroscopy measurements on these materials. Our study reveals that the incorporation of multiple cations at the A-site of the structure (AB2O4) significantly modulates the magnetic properties. These compounds exhibit transitions from complex ferrimagnetic ([Ni0.2Mn0.2Co0.2Cu0.2Zn0.2]Cr2O4) to antiferromagnetic ([Ni0.2Mg0.2Co0.2Cu0.2Zn0.2]Cr2O4) states, with remarkable coercivity variations, demonstrating the ability to tailor magnetic responses through compositional design.

Published
2024

38. A 0.1–4.71 GHz Integer-N CP-PLL-Based Low-Power Frequency Synthesizer for High-Speed Applications

Author

Sharma, Jyoti, Ahmad, Riyaz, Varma, Tarun, Boolchandani, Dharmendar, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Gupta, Anu, editor, Pandey, Jai Gopal, editor, Chaturvedi, Nitin, editor, and Dwivedi, Devesh, editor

Published
2025
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50. The role of susceptibility-weighted imaging & contrast-enhanced MRI in the diagnosis of primary CNS vasculitis: a large case series

Author

Agarwal, Sushant, Sebastian, Leve Joseph Devarajan, Gaikwad, Shailesh, Srivastava, M. V. Padma, Sharma, M. C., Singh, Manmohan, Bhatia, Rohit, Agarwal, Ayush, Sharma, Jyoti, Dash, Deepa, Goyal, Vinay, Srivastava, Achal K., Tripathi, Manjari, Suri, Vaishali, Singh, Mamta B., Sarkar, Chitra, Suri, Ashish, Singh, Rajesh K., Vibha, Deepti, Pandit, Awadh K., Rajan, Roopa, Gupta, Anu, Elavarasi, A., Radhakrishnan, Divya M., Das, Animesh, Tandon, Vivek, Doddamani, Ramesh, Upadhyay, Ashish, Vishnu, Venugopalan Y., and Garg, Ajay

Published
2024
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