# Heat transport study of the spin liquid candidate 1T-TaS2

## TL;DR

This study measures ultra-low-temperature thermal conductivity in 1T-TaS2 to investigate its potential as a quantum spin liquid, finding no evidence of fermionic magnetic excitations and constraining theoretical models.

## Contribution

It provides the first detailed thermal conductivity measurements on 1T-TaS2, offering critical experimental constraints on its proposed quantum spin liquid state.

## Key findings

- Residual linear thermal conductivity is essentially zero.
- Thermal conductivity is insensitive to magnetic fields up to 9 T.
- Results exclude the presence of itinerant magnetic excitations with fermionic statistics.

## Abstract

We present the ultra-low-temperature thermal conductivity measurements on single crystals of the prototypical charge-density-wave material 1$T$-TaS$_2$, which was recently argued to be a candidate for quantum spin liquid. Our experiments show that the residual linear term of thermal conductivity at zero field is essentially zero, within the experimental accuracy. Furthermore, the thermal conductivity is found to be insensitive to the magnetic field up to 9 T. These results clearly demonstrate the absence of itinerant magnetic excitations with fermionic statistics in bulk 1$T$-TaS$_2$ and, thus, put a strong constraint on the theories of the ground state of this material.