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A molecular Mott insulator $\beta$'-EtMe$_3$Sb[Pd(dmit)$_2$]$_2$ is a quantumspin liquid candidate. In 2010, it was reported that thermal conductivity of$\beta$'-EtMe$_3$Sb[Pd(dmit)$_2$]$_2$ is characterized by its large value andgapless behavior (a finite temperature-linear term). In 2019, however, twoother research groups reported opposite data (much smaller value and avanishingly small temperature-linear term) and the discrepancy in the thermalconductivity measurement data emerges as a serious problem concerning theground state of the quantum spin liquid. Recently, the cooling rate wasproposed to be an origin of the discrepancy. We examined effects of the coolingrate on electrical resistivity, low-temperature crystal structure, and$^{13}$C-NMR measurements and could not find any significant cooling ratedependence.

crystals

A Discrepancy in Thermal Conductivity Measurement Data of Quantum Spin  Liquid $\beta$'-EtMe$_3$Sb[Pd(dmit)$_2$]$_2$ (dmit =  1,3-Dithiol-2-thione-4,5-dithiolate)