Thermal expansion and magnetostriction of pure and doped RAgSb2 (R = Y, Sm, La) single crystals

TL;DR

This study investigates the anisotropic thermal expansion, magnetostriction, and pressure effects on phase transitions in pure and doped RAgSb2 single crystals, revealing opposite effects of in-plane and c-axis pressures and detecting quantum oscillations.

Contribution

It provides new measurements of thermal expansion, magnetostriction, and uniaxial pressure derivatives in RAgSb2 crystals, including doped variants, with insights into phase transition sensitivities.

Findings

In-plane and c-axis pressure have opposite effects on phase transitions.

Quantum oscillations observed in magnetostriction for pure compounds.

Uniaxial pressure derivatives of electronic orbits evaluated for YAgSb2 and LaAgSb2.

Abstract

Data on temperature-dependent, anisotropic thermal expansion in pure and doped RAgSb2 (R = Y, Sm, La) single crystals are presented. Using the Ehrenfest relation and heat capacity measurements, uniaxial pressure derivatives for long range magnetic ordering and charge density wave transition temperatures are evaluated and compared with the results of the direct measurements under hydrostatic pressure. In-plane and c-axis pressure have opposite effect on the phase transitions in these materials, with in-plane effects being significantly weaker. Quantum oscillations in magnetostriction were observed for the three pure compounds, with the possible detection of new frequencies in SmAgSb2 and LaAgSb2. The uniaxial (along the c-axis) pressure derivatives of the dominant extreme orbits (beta) were evaluated for YAgSb2 and LaAgSb2.