Unusual Thermal Hall Effect in a Kitaev Spin Liquid Candidate α-RuCl3

被引：172

作者：

Kasahara, Y. ^{[1
]}

Sugii, K. ^{[2
]}

Ohnishi, T. ^{[1
]}

Shimozawa, M. ^{[2
]}

Yamashita, M. ^{[2
]}

Kurita, N. ^{[3
]}

Tanaka, H. ^{[3
]}

Nasu, J. ^{[3
]}

Motome, Y. ^{[4
]}

Shibauchi, T. ^{[5
]}

Matsuda, Y. ^{[1
]}

机构：

[1] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[4] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

[5] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 21期

基金：

日本学术振兴会;

关键词：

QUANTUM; EXCITATIONS; MAGNET;

D O I：

10.1103/PhysRevLett.120.217205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Kitaev quantum spin liquid displays the fractionalization of quantum spins into Majorana fermions. The emergent Majorana edge current is predicted to manifest itself in the form of a finite thermal Hall effect, a feature commonly discussed in topological superconductors. Here we report on thermal Hall conductivity kappa(xy) measurements in alpha-RuCl3, a candidate Kitaev magnet with the two-dimensional honeycomb lattice. In a spin-liquid (Kitaev paramagnetic) state below the temperature characterized by the Kitaev interaction J(K)/k(B) similar to 80 K, positive kappa(xy) develops gradually upon cooling, demonstrating the presence of highly unusual itinerant excitations. Although the zero-temperature property is masked by the magnetic ordering at T-N = 7 K, the sign, magnitude, and T dependence of kappa(xy)/T at intermediate temperatures follows the predicted trend of the itinerant Majorana excitations.

引用

页数：6

共 40 条

[1]

[Anonymous], ARXIV170107056

[2] Spin liquids in frustrated magnets [J].