Electronic transport and specific heat of 1T- VSe2

TL;DR

This study investigates the low-temperature thermoelectric, thermal, and electrical properties of 1T-VSe2, revealing a charge density wave transition near 110K and providing insights into its metallic and hybridized band behavior.

Contribution

First detailed report of specific heat anomaly at the CDW transition in 1T-VSe2, along with comprehensive transport measurements across the CDW phases.

Findings

Charge density wave transition near 110K observed in multiple properties

Weak specific heat anomaly at the CDW transition

Metallic behavior with electron-phonon scattering above 110K

Abstract

The results of low temperature thermoelectric power and the specific heat of 1T-VSe2 (Vanadium diselenide) have been reported along with the electrical resistivity, and Hall coefficient of the compound. The Charge Density Wave (CDW) transition is observed near 110K temperature in all these properties. The Thermoelectric power has been measured from 15K to 300K spanning the incommensurate and commensurate CDW regions. We observed a weak anomaly at the CDW transition for the first time in the specific heat of VSe2. The linear temperature dependence of resistivity and thermoelectric power at higher temperatures suggests a normal metallic behavior and electron-phonon scattering above the CDW transition. The positive thermoelectric power and negative Hall coefficient along with strongly temperature dependent behavior in the CDW phase suggest a mixed conduction related to the strongly hybridized s-p-d bands in this compound.