Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr4O8

doi:10.1088/1674-1056/ade4b4

中国物理B ›› 2025, Vol. 34 ›› Issue (11): 117801-117801.doi: 10.1088/1674-1056/ade4b4

Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr₄O₈

Xiang Li(李想)^1,†, Wei Ren(任玮)^1,†, Bo Zhang(张博)¹, Yan-Zhen Cai(蔡焱桢)¹, Zhi-Wei Li(李志伟)¹, Jianting Ji(籍建葶)², Feng Jin(金峰)², Anmin Zhang(张安民)^1,‡, and Qingming Zhang(张清明)^2,1

1 School of Physical Science and Technology, Key Laboratory of Quantum Theory and Applications of MoE, Lanzhou University, Lanzhou 730000, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2025-04-15 修回日期:2025-06-04 接受日期:2025-06-16 发布日期:2025-10-30
基金资助:
This work was supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1402704 and 2022YFA1408302), the National Natural Science Foundation of China (Grant No. 12274186), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33010100), and the Synergetic Extreme Condition User Facility (SECUF). The authors are grateful for the support provided by the Supercomputing Center of Lanzhou University.

Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr₄O₈

1 School of Physical Science and Technology, Key Laboratory of Quantum Theory and Applications of MoE, Lanzhou University, Lanzhou 730000, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2025-04-15 Revised:2025-06-04 Accepted:2025-06-16 Published:2025-10-30
Contact: Anmin Zhang E-mail:amzhang@lzu.edu.cn
Supported by:
This work was supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1402704 and 2022YFA1408302), the National Natural Science Foundation of China (Grant No. 12274186), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33010100), and the Synergetic Extreme Condition User Facility (SECUF). The authors are grateful for the support provided by the Supercomputing Center of Lanzhou University.

摘要/Abstract

摘要： Spin—phonon coupling is important in chromate spinel oxides $A$Cr$_2$O$_4$, but its role in LiFeCr$_4$O$_8$ is not well understood. In this paper, we employ Raman scattering and first-principles phonon calculations to study this material. Ten out of 13 Raman-active modes are well assigned. Notably, no phonon splitting is observed across the structural phase transition due to the remarkably small Grüneisen constants. This observation, in conjunction with the structural data, provides compelling evidence that the structural phase transition in LiFeCr$_4$O$_8$ is primarily driven by the spin-driven Jahn—Teller effect. Interestingly, some Raman modes (at 207~cm$^{-1}$, 306~cm$^{-1}$ and 462~cm$^{-1}$) exhibit unusual linewidth behavior across the temperature range investigated. Furthermore, the Raman spectra in different phases show no magnetic field dependence. These results suggest that phonons couple with short-range spin correlations, offering insights into how spin and lattice degrees of freedom interact in frustrated systems.

关键词: Raman scattering, phonons, first-principles phonon calculations, magnetic materials

Abstract: Spin—phonon coupling is important in chromate spinel oxides $A$Cr$_2$O$_4$, but its role in LiFeCr$_4$O$_8$ is not well understood. In this paper, we employ Raman scattering and first-principles phonon calculations to study this material. Ten out of 13 Raman-active modes are well assigned. Notably, no phonon splitting is observed across the structural phase transition due to the remarkably small Grüneisen constants. This observation, in conjunction with the structural data, provides compelling evidence that the structural phase transition in LiFeCr$_4$O$_8$ is primarily driven by the spin-driven Jahn—Teller effect. Interestingly, some Raman modes (at 207~cm$^{-1}$, 306~cm$^{-1}$ and 462~cm$^{-1}$) exhibit unusual linewidth behavior across the temperature range investigated. Furthermore, the Raman spectra in different phases show no magnetic field dependence. These results suggest that phonons couple with short-range spin correlations, offering insights into how spin and lattice degrees of freedom interact in frustrated systems.

Key words: Raman scattering, phonons, first-principles phonon calculations, magnetic materials

中图分类号: (Infrared and Raman spectra)

78.30.-j

63.20.-e (Phonons in crystal lattices) 63.20.dd (Measurements) 74.25.Kc (Phonons)

Xiang Li(李想), Wei Ren(任玮), Bo Zhang(张博), Yan-Zhen Cai(蔡焱桢), Zhi-Wei Li(李志伟), Jianting Ji(籍建葶), Feng Jin(金峰), Anmin Zhang(张安民), and Qingming Zhang(张清明). Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr₄O₈[J]. 中国物理B, 2025, 34(11): 117801-117801.

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Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr₄O₈

Coupling between phonon and short-range spin correlations in frustrated spinel LiFeCr₄O₈

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