Unusual Phonon Heat Transport in α-RuCl3: Strong Spin-Phonon Scattering and Field-Induced Spin Gap

被引：171

作者：

Hentrich, Richard ^{[1
]}

Wolter, Anja U. B. ^{[1
]}

Zotos, Xenophon ^{[1
,2
,3
]}

Brenig, Wolfram ^{[4
]}

Nowak, Domenic ^{[5
]}

Isaeva, Anna ^{[5
]}

Doert, Thomas ^{[5
]}

Banerjee, Arnab ^{[6
]}

Lampen-Kelley, Paula ^{[7
,8
]}

Mandrus, David G. ^{[7
,8
]}

Nagler, Stephen E. ^{[6
]}

Sears, Jennifer ^{[9
,10
]}

Kim, Young-June ^{[9
,10
]}

Buechner, Bernd ^{[1
,11
,12
]}

Hess, Christian ^{[1
,12
]}

机构：

[1] Leibniz Inst Solid State & Mat Res, D-01069 Dresden, Germany

[2] Univ Crete, ITCP, Iraklion 71003, Greece

[3] Univ Crete, Dept Phys, CCQCN, Iraklion 71003, Greece

[4] TU Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany

[5] Tech Univ Dresden, Dept Chem & Food Chem, D-01062 Dresden, Germany

[6] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN USA

[7] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA

[8] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[9] Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7, Canada

[10] Univ Toronto, Ctr Quantum Mat, 60 St George St, Toronto, ON M5S 1A7, Canada

[11] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany

[12] Tech Univ Dresden, Ctr Transport & Devices, D-01069 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 11期

基金：

加拿大自然科学与工程研究理事会;

关键词：

LATTICE THERMAL CONDUCTIVITY; LIQUID; MAGNET; MODEL;

D O I：

10.1103/PhysRevLett.120.117204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The honeycomb Kitaev-Heisenberg model is a source of a quantum spin liquid with Majorana fermions and gauge flux excitations as fractional quasiparticles. Here we unveil the highly unusual low-temperature heat conductivity kappa of alpha-RuCl (3), a prime candidate for realizing such physics: beyond a magnetic field of B-c approximate to 7.5 T, kappa increases by about one order of magnitude, both for in-plane as well as out-of-plane transport. This clarifies the unusual magnetic field dependence unambiguously to be the result of severe scattering of phonons off putative Kitaev-Heisenberg excitations in combination with a drastic field-induced change of the magnetic excitation spectrum. In particular, an unexpected, large energy gap arises, which increases linearly with the magnetic field, reaching remarkable (h) over bar omega(0) /k(B) approximate to 50 K at 18 T.

引用

页数：6

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