中国物理B ›› 2020, Vol. 29 ›› Issue (7): 77508-077508.doi: 10.1088/1674-1056/ab9617

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Degenerate antiferromagnetic states in spinel oxide LiV2O4

Ben-Chao Gong(龚本超), Huan-Cheng Yang(杨焕成), Kui Jin(金魁), Kai Liu(刘凯), Zhong-Yi Lu(卢仲毅)   

  1. 1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China;
    2 Beijing Computational Science Research Center, Beijing 100193, China;
    3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    4 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
  • 收稿日期:2020-03-05 修回日期:2020-05-18 出版日期:2020-07-05 发布日期:2020-07-05
  • 通讯作者: Kai Liu, Zhong-Yi Lu E-mail:kliu@ruc.edu.cn;zlu@ruc.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFA0302903 and 2019YFA0308603), the National Natural Science Foundation of China (Grant Nos. 11774422, 11774424, and 11674374), the CAS Interdisciplinary Innovation Team, the Fundamental Research Funds for the Central Universities, China, and the Research Funds of Renmin University of China (Grant No. 19XNLG13).

Degenerate antiferromagnetic states in spinel oxide LiV2O4

Ben-Chao Gong(龚本超)1, Huan-Cheng Yang(杨焕成)2,1, Kui Jin(金魁)3,4, Kai Liu(刘凯)1, Zhong-Yi Lu(卢仲毅)1   

  1. 1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China;
    2 Beijing Computational Science Research Center, Beijing 100193, China;
    3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    4 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
  • Received:2020-03-05 Revised:2020-05-18 Online:2020-07-05 Published:2020-07-05
  • Contact: Kai Liu, Zhong-Yi Lu E-mail:kliu@ruc.edu.cn;zlu@ruc.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFA0302903 and 2019YFA0308603), the National Natural Science Foundation of China (Grant Nos. 11774422, 11774424, and 11674374), the CAS Interdisciplinary Innovation Team, the Fundamental Research Funds for the Central Universities, China, and the Research Funds of Renmin University of China (Grant No. 19XNLG13).

摘要: The magnetic and electronic properties of spinel oxide LiV2O4 have been systematically studied by using the spin-polarized first-principles electronic structure calculations. We find that a series of magnetic states, in which the ferromagnetic (FM) V4 tetrahedra are linked together through the corner-sharing antiferromagnetic (AFM) V4 tetrahedra, possess degenerate energies lower than those of other spin configurations. The large number of these energetically degenerated states being the magnetic ground state give rise to strong magnetic frustration as well as large magnetic entropy in LiV2O4. The corresponding band structure and density of states of such a typical magnetic state in this series, i.e., the ditetrahedron (DT) AFM state, demonstrate that LiV2O4 is in the vicinity of a metal-insulator transition. Further analysis suggests that the t2g and eg orbitals of the V atoms play different roles in the magnetic exchange interactions. Our calculations are consistent with previous experimental measurements and shed light on understanding the exotic magnetism and the heavy-fermion behavior of LiV2O4.

关键词: spinel oxide, magnetic properties, heavy fermion, first-principles calculations

Abstract: The magnetic and electronic properties of spinel oxide LiV2O4 have been systematically studied by using the spin-polarized first-principles electronic structure calculations. We find that a series of magnetic states, in which the ferromagnetic (FM) V4 tetrahedra are linked together through the corner-sharing antiferromagnetic (AFM) V4 tetrahedra, possess degenerate energies lower than those of other spin configurations. The large number of these energetically degenerated states being the magnetic ground state give rise to strong magnetic frustration as well as large magnetic entropy in LiV2O4. The corresponding band structure and density of states of such a typical magnetic state in this series, i.e., the ditetrahedron (DT) AFM state, demonstrate that LiV2O4 is in the vicinity of a metal-insulator transition. Further analysis suggests that the t2g and eg orbitals of the V atoms play different roles in the magnetic exchange interactions. Our calculations are consistent with previous experimental measurements and shed light on understanding the exotic magnetism and the heavy-fermion behavior of LiV2O4.

Key words: spinel oxide, magnetic properties, heavy fermion, first-principles calculations

中图分类号:  (Magnetic oxides)

  • 75.47.Lx
75.30.Mb (Valence fluctuation, Kondo lattice, and heavy-fermion phenomena) 71.20.-b (Electron density of states and band structure of crystalline solids)