Exchange field enhanced upper critical field of the superconductivity in compressed antiferromagnetic EuTe2

被引：2

作者：

Sun, Hualei ^{[1
]}

Qiu, Liang ^{[1
]}

Han, Yifeng ^{[2
]}

Zhang, Yunwei ^{[1
]}

Wang, Weiliang ^{[3
]}

Huang, Chaoxin ^{[1
]}

Liu, Naitian ^{[1
]}

Huo, Mengwu ^{[1
]}

Li, Lisi ^{[1
]}

Liu, Hui ^{[1
]}

Liu, Zengjia ^{[1
]}

Cheng, Peng ^{[4
,5
]}

Zhang, Hongxia ^{[4
,5
]}

Wang, Hongliang ^{[6
]}

Hao, Lijie ^{[6
]}

Li, Man-Rong ^{[2
]}

Yao, Dao-Xin ^{[1
]}

Hou, Yusheng ^{[1
]}

Dai, Pengcheng ^{[7
]}

Wang, Meng ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Ctr Neutron Sci & Technol, Sch Phys, Guangdong Prov Key Lab Magnetoelect Phys & Devices, Guangzhou 510275, Guangdong, Peoples R China

[2] Sun Yat Sen Univ, Sch Chem, Key Lab Bioinorgan & Synthet Chem, Minist Educ, Guangzhou 510275, Guangdong, Peoples R China

[3] Sun Yat Sen Univ, Sch Phys, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

[4] Renmin Univ China, Dept Phys, Lab Neutron Scattering, Beijing 100872, Peoples R China

[5] Renmin Univ China, Dept Phys, Beijing Key Lab Optoelect Funct Mat & MicroNano De, Beijing 100872, Peoples R China

[6] China Inst Atom Energy, POB 275-30, Beijing 102413, Peoples R China

[7] Rice Univ, Rice Ctr Quantum Mat, Dept Phys & Astron, Houston, TX USA

来源：

COMMUNICATIONS PHYSICS | 2023年 / 6卷 / 01期

基金：

中国国家自然科学基金;

关键词：

PRESSURE-INDUCED SUPERCONDUCTIVITY; CRYSTAL-STRUCTURE; SPIN; PROGRAM;

D O I：

10.1038/s42005-023-01155-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Understanding the interplay between superconductivity and magnetism has been a longstanding challenge in condensed matter physics. Here we report high pressure studies on the C-type antiferromagnetic semiconductor EuTe2 up to 36.0 GPa. A structural transition from the I4/mcm to the C2/m space group is identified at similar to 16 GPa. Superconductivity is observed above similar to 5 GPa in both structures. In the low-pressure phase, magnetoresistance measurements reveal strong couplings between the local moments of Eu2+ and the conduction electrons of Te 5p orbits. The upper critical field of superconductivity is well above the Pauli limit. While EuTe2 becomes nonmagnetic in the high-pressure phase and the upper critical field drops below the Pauli limit. Our results demonstrate that the high upper critical field of EuTe2 in the low-pressure phase is due to the exchange field compensation effect of Eu2+ and the superconductivity in both structures may arise in the framework of the Bardeen-Cooper-Schrieffer theory.

引用

页数：7

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