Electronic Origin of Half-metal to Semiconductor Transition and Colossal Magnetoresistance in Spinel HgCr<sub>2</sub>Se<sub>4</sub>

doi:arXiv:2211.16690

	Electronic Origin of Half-metal to Semiconductor Transition and Colossal Magnetoresistance in Spinel HgCr₂Se₄
	Liang, Aiji1,2,3 ; Li, Zhilin 4; Zhang, Shihao1,2 ; Sun, Shucui 5,6; Liu, Shuai1 ; Chen, Cheng1,2,3,7 ; Yang, Haifeng1 ; Cui, Shengtao1 ; Mo, Sung-Kwan 3; Yang, Shuai 4; Li, Yongqing 4; Wang, Meixiao1,2 ; Yang, Lexian 5,6; Liu, Jianpeng1,2 ; Liu, Zhongkai1,2 ; Chen, Yulin1,2,5,6,7
	2022-11-30
状态	已发表
摘要	Half-metals are ferromagnets hosting spin-polarized conducting carriers and crucial for spintronics applications. The chromium spinel HgCr2Se4 represents a unique type of half-metal, which features a half-metal to semiconductor transition (HMST) and exhibits colossal magnetoresistance (CMR) across the ferromagnetic-paramagnetic (FM-PM) transition. Using angle-resolved photoemission spectroscopy (ARPES), we find that the Fermi surface of n-type HgCr2Se4 (n-HgCr2Se4) consists of a single electron pocket which moves above the Fermi level (EF) upon the FM-PM transition, leading to the HMST. Such a Lifshitz transition manifests a giant band splitting which originates from the exchange interaction unveiled with a specific chemical nonstoichiometry. The exchange band splitting and the chemical nonstoichiometry are two key ingredients to the HMST and CMR, consistent with our ab-initio calculation. Our findings provide spectroscopic evidences of the electronic origin of the anomalous properties of HgCr2Se4, which address the unique phase transition in half-metals.
DOI	arXiv:2211.16690
相关网址	查看原文
出处	Arxiv
WOS记录号	PPRN:23252243
WOS类目	Physics, Condensed Matter
资助项目	Chinese Academy of Science-Shanghai Science Research Center[
文献类型	预印本
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/348090
专题	物质科学与技术学院物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_特聘教授组_陈宇林物质科学与技术学院_博士生物质科学与技术学院_公共科研平台_拓扑物理实验室物质科学与技术学院_PI研究组_刘健鹏组大科学中心_公共科研平台_大科学装置建设部物质科学与技术学院_PI研究组_陈成组
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai, Peoples R China 2.ShanghaiTech Lab Topol Phys, Shanghai 200031, Peoples R China 3.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720, USA 4.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 5.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China 6.Tsinghua Univ, Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China 7.Univ Oxford, Dept Phys, Oxford OX1 3PU, England
推荐引用方式 GB/T 7714	Liang, Aiji,Li, Zhilin,Zhang, Shihao,et al. Electronic Origin of Half-metal to Semiconductor Transition and Colossal Magnetoresistance in Spinel HgCr₂Se₄. 2022.