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

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, ${\kappa }_0/T\equiv \kappa /T(T\to 0)$, has been observed and attributed to the presence of itinerant gapless excitations. Here we show that the data of $\kappa$ measured in several single crystals are divided into two groups with and without the residual linear term. In the first group with finite ${\kappa }_0/T$, the phonon thermal conductivity ${\kappa }_{ph}$ is comparable to that of other organic compounds. In these crystals, the phonon mean free path ${\ell }_{ph}$ saturates at low temperatures, being limited by sample size. On the other hand, in the second group with zero ${\kappa }_0/T$, ${\kappa }_{ph}$ is one order of magnitude smaller than that in the first group, comparable to that of amorphous solids. In contrast to the first group, ${\ell }_{ph}$ shows a glassy-like non-saturating behavior at low temperatures. These results suggest that the crystals with long ${\ell }_{ph}$ are required to discuss the magnetic excitations by thermal conductivity measurements.

arXiv comment4 pages, 3 figures

References in corpus (21)

• Anyons in an exactly solved model and beyond
• Phonon-glass electron-crystal thermoelectric clathrates: Experiments and theory
• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Rare-earth triangular lattice spin liquid: a single-crystal study of YbMgGaO${}_4$
• Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO${}_4$
• Is 1T-TaS${}_2$ a 40 year old quantum spin liquid?
• Crystalline Electric Field Randomness in the Triangular Lattice Spin-Liquid YbMgGaO${}_4$
• Thermal Hall conductivity in the frustrated pyrochlore magnet Tb2Ti2O7
• Orbital magnetic field effects in spin liquid with spinon Fermi sea: Possible application to $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$
• Absence of magnetic thermal conductivity in the quantum spin liquid candidate YbMgGaO4
• Magnetic field - temperature phase diagram of quasi-two-dimensional organic superconductor lambda-(BETS)_2 GaCl_4 studied via thermal conductivity
• Heat Conduction in $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Thermal Hall effect in a phonon-glass Ba${}_3$CuSb${}_2$O${}_9$
• Novel Pauli-paramagnetic quantum phase in a Mott insulator
• Absence of magnetic thermal conductivity in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2 -- revisited
• Thermal conductivity of the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2: No evidence of mobile gapless excitations
• Magnetically originated phonon-glass-like behavior in Tb_2Ti_2O_7 single crystal
• Quantum-disordered state of magnetic and electric dipoles in a hydrogen-bonded Mott system
• Disorder driven spin-orbital liquid behaviour in the Ba${}_3$XSb${}_2$O${}_9$ materials
• Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe${}_3$Sb[Pd(dmit)${}_2$]${}_2$
• Thermal-transport studies of Two-dimensional Quantum Spin Liquids

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• $x$-[Pd(dmit)${}_2$]${}_2$ as a quasi-1D, scalene Heisenberg model
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