High pressure study of transport properties in Co${}_{1/3}$NbS${}_2$

Abstract

This is the first study of the effect of pressure on transition metal dichalcogenides intercalated by atoms that order magnetically. Co${}_{1/3}$NbS${}_2$ is a layered system where the intercalated Co atoms order antiferromagnetically at T${}_N$ = 26 K at ambient pressure. We have conducted a detailed study of dc-resistivity ($\rho$), thermoelectric power (S) and thermal conductivity ($\kappa$). We found that at ambient pressure the magnetic transition corresponds to a well pronounced peak in dS/dT, as well as to a kink in the dc-resistivity. The effect of ordering on the thermal conductivity is rather small but, surprisingly, more pronounced in the lattice contribution than in the electronic contribution to $\kappa$. Under pressure, the resistivity increases in the high temperature range, contrary to all previous measurements in other layered transition metal dichalcogenides (TMD). In the low temperature range, the strong dependences of thermopower and resistivity on pressure are observed below TN, which, in turn, also depends on pressure at rate of dT${}_N$/dp $\approx$ -1 K/kbar. Several possible microscopic explanations of the reduction of the ordering temperature and the evolution of the transport properties with pressure are discussed.

References in corpus (4)

• Atomically thin MoS2: A new direct-gap semiconductor
• Optical identification of atomically thin dichalcogenide crystals
• Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach
• Non-uniform doping across the Fermi surface of NbS${}_2$ intercalates

Cited by in corpus (9)

• Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet Co${}_{1/3}$NbS${}_2$
• Pressure dependence of superconducting critical temperature and upper critical field of 2H-NbS2
• Role of intercalated Cobalt in the electronic structure of Co${}_{1/3}$NbS${}_2$
• Electrical and thermal transport in van der Waals magnets 2H-M${}_x$TaS${}_2$ (M = Mn, Co)
• Magnetic-field-induced FM-AFM metamagnetic transition and strong negative magnetoresistance in Mn${}_{1/4}$NbS${}_2$ under pressure
• Electronic transport and magnetism in the alternating stack of metallic and highly frustrated magnetic layers in Co${}_{1/3}$NbS${}_2$
• Thermal transport and mixed valence in ZrTe${}_3$ doped with Hf and Se
• Enhanced Superconductivity and Electron Correlations in Intercalated ZrTe${}_3$
• Optical fingerprints of the electronic band reconstruction in van der Waals magnetic materials