Anomalous Nernst and Righi-Leduc Effects in Mn3Sn: Berry Curvature and Entropy Flow

被引：266

作者：

Li, Xiaokang ^{[1
,2
]}

Xu, Liangcai ^{[1
,2
]}

Ding, Linchao ^{[1
,2
]}

Wang, Jinhua ^{[1
,2
]}

Shen, Mingsong ^{[1
,2
]}

Lu, Xiufang ^{[1
,2
]}

Zhu, Zengwei ^{[1
,2
]}

Behnia, Kamran ^{[1
,2
,3
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Hubei, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China

[3] PSL Res Univ, Lab Phys & Etude Mat UPMC CNRS, ESPCI Paris, F-75005 Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 05期

基金：

美国国家科学基金会;

关键词：

SPIN STRUCTURE; WEAK FERROMAGNETISM; HALL CONDUCTIVITY; PHASE; TEMPERATURE;

D O I：

10.1103/PhysRevLett.119.056601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a study of electric, thermal and thermoelectric response in noncollinear antiferromagnet Mn3Sn, which hosts a large anomalous Hall effect (AHE). Berry curvature generates off-diagonal thermal (Righi-Leduc) and thermoelectric (Nernst) signals, which are detectable at room temperature and invertible with a small magnetic field. The thermal and electrical Hall conductivities respect the Wiedemann-Franz law, implying that the transverse currents induced by the Berry curvature are carried by Fermi surface quasiparticles. In contrast to conventional ferromagnets, the anomalous Lorenz number remains close to the Sommerfeld number over the whole temperature range of study, excluding any contribution by inelastic scattering and pointing to the Berry curvature as the unique source of AHE. The anomalous off-diagonal thermo-electric and Hall conductivities are strongly temperature dependent and their ratio is close to k(B)/e.

引用

页数：5

共 39 条

[1]

Behnia K, 2015, FUNDAMENTALS OF THERMOELECTRICITY, P1, DOI 10.1093/acprof:oso/9780199697663.001.0001

[2] Nernst effect in metals and superconductors: a review of concepts and experiments [J].