Thermal Conductivity of the Quantum Spin Liquid Candidate EtMe3Sb[Pd(dmit)2]2: No Evidence of Mobile Gapless Excitations

被引：59

作者：

Bourgeois-Hope, P. ^{[1
,2
]}

Laliberte, F. ^{[1
,2
]}

Lefrancois, E. ^{[1
,2
]}

Grissonnanche, G. ^{[1
,2
]}

de Cotret, S. Rene ^{[1
,2
]}

Gordon, R. ^{[1
,2
]}

Kitou, S. ^{[3
]}

Sawa, H. ^{[3
]}

Cui, H. ^{[4
]}

Kato, R. ^{[4
]}

Taillefer, L. ^{[1
,2
,5
]}

Doiron-Leyraud, N. ^{[1
,2
]}

机构：

[1] Univ Sherbrooke, Inst Quant, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Sherbrooke, RQMP, Sherbrooke, PQ J1K 2R1, Canada

[3] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[4] RIKEN, Wako, Saitama 3510198, Japan

[5] Canadian Inst Adv Res, Toronto, ON M5G 1M1, Canada

来源：

PHYSICAL REVIEW X | 2019年 / 9卷 / 04期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

STATE;

D O I：

10.1103/PhysRevX.9.041051

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The thermal conductivity. of the quasi-2D organic spin-liquid candidate EtMe3Sb[Pd(dmit)(2)](2) (dmit-131) was measured at low temperatures, down to 0.07 K. We observe a vanishingly small residual linear term kappa(0)/T, in kappa/T vs T as T -> 0. This shows that the low-energy excitations responsible for the sizable residual linear term. in the specific heat C, seen in C/T vs T as T -> 0, are localized. We conclude that there are no mobile gapless excitations in this spin-liquid candidate, in contrast with a prior study of dmit-131 that reported a large kappa(0)/T value [Yamashita et al., Science 328, 1246 (2010)]. Our study shows that dmit-131 is in fact similar to kappa-(BEDT-TTF)(2)Cu-2(CN)(3), another quasi-2D organic spin-liquid candidate where a vanishingly small kappa(0)/T and a sizable gamma are seen. We attribute heat conduction in these organic insulators without magnetic order to phonons undergoing strong spin-phonon scattering, as observed in several other spin-liquid materials.

引用

页数：8

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