Boundary-limited and glassy-like phonon thermal conduction in EtMe$_3$Sb[Pd(dmit)$_2$]$_2$

Minoru Yamashita

doi:10.7566/JPSJ.89.086002

paper

Boundary-limited and glassy-like phonon thermal conduction in EtMe $_{3}$ Sb[Pd(dmit) $_{2}$ ] $_{2}$

arXiv:1905.08420 · doi:10.7566/JPSJ.89.086002

Abstract

In molecular-based quantum-spin-liquid candidate EtMe $_{3}$ Sb[Pd(dmit) $_{2}$ ] $_{2}$ with two-dimensional $S$ =1/2 triangular lattice, a finite residual linear term in the thermal conductivity, $κ_{0} / T \equiv κ / T (T \to 0)$ , has been observed and attributed to the presence of itinerant gapless excitations. Here we show that the data of $κ$ measured in several single crystals are divided into two groups with and without the residual linear term. In the first group with finite $κ_{0} / T$ , the phonon thermal conductivity $κ_{p h}$ is comparable to that of other organic compounds. In these crystals, the phonon mean free path $ℓ_{p h}$ saturates at low temperatures, being limited by sample size. On the other hand, in the second group with zero $κ_{0} / T$ , $κ_{p h}$ is one order of magnitude smaller than that in the first group, comparable to that of amorphous solids. In contrast to the first group, $ℓ_{p h}$ shows a glassy-like non-saturating behavior at low temperatures. These results suggest that the crystals with long $ℓ_{p h}$ are required to discuss the magnetic excitations by thermal conductivity measurements.

4 pages, 3 figures

Boundary-limited and glassy-like phonon thermal conduction in EtMe $_{3}$ Sb[Pd(dmit) $_{2}$ ] $_{2}$

Abstract

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Boundary-limited and glassy-like phonon thermal conduction in EtMe3​Sb[Pd(dmit)2​]2​

Abstract

References in corpus (7)

Cited by in corpus (3)

Boundary-limited and glassy-like phonon thermal conduction in EtMe $_{3}$ Sb[Pd(dmit) $_{2}$ ] $_{2}$