Effects of physical and chemical pressure on charge density wave transitions in LaAg1-xAuxSb2 single crystals

TL;DR

This study investigates how both chemical and physical pressures influence charge density wave transitions in LaAg1-xAuxSb2 single crystals, revealing their comparable effects on structural and electronic properties.

Contribution

It demonstrates the equivalence of chemical and physical pressure effects on CDW transitions in a non-cubic system, highlighting the role of unit cell volume.

Findings

Chemical and physical pressures similarly suppress CDW transitions.

Unit cell volume correlates with CDW ordering temperatures.

Anomalies observed in electrical transport when CDW is suppressed.

Abstract

The structural characterization and electrical transport measurements at ambient and applied pressures of the compounds of the La(Ag1-xAux)Sb2 family are presented. Up to two charge density wave (CDW) transitions could be detected upon cooling from room temperature and an equivalence of the effects of chemical and physical pressure on the CDW ordering temperatures was observed with the unit cell volume being a salient structural parameter. As such La(Ag1-xAux)Sb2 is a rare example of a non-cubic system that exhibits good agreement between the effects of applied, physical, pressure and changes in unit cell volume from steric changes induced by isovalent substitution. Additionally, for La(Ag0.54Au0.46)Sb2 anomalies in low temperature electrical transport were observed in the pressure range where the lower charge density wave is completely suppressed.