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Thermal Conductivity of the Quantum Spin Liquid CandidateEtMe3Sb[Pd(dmit)2]2: No Evidence of Mobile Gapless Excitations
Physical Review X ( IF 12.577 ) Pub Date : 2019-12-10 , DOI: 10.1103/physrevx.9.041051
P. Bourgeois-Hope, F. Laliberté, E. Lefrançois, G. Grissonnanche, S. René de Cotret, R. Gordon, S. Kitou, H. Sawa, H. Cui, R. Kato, L. Taillefer, and N. Doiron-Leyraud

The thermal conductivity κ 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 κ0/T, in κ/T vs T as T0. This shows that the low-energy excitations responsible for the sizable residual linear term γ in the specific heat C, seen in C/T vs T as T0, 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 κ0/T value [ , Science 328, 1246 (2010)]. Our study shows that dmit-131 is in fact similar to κ(BEDTTTF)2Cu2(CN)3, another quasi-2D organic spin-liquid candidate where a vanishingly small κ0/T and a sizable γ 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.
更新日期:2019-12-11

 

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