Grüneisen divergence near the structural quantum phase transition in ScF 3

Abstract

The cubic perovskite ScF 3 exhibits pronounced isotropic negative thermal expansion and a structural quantum phase transition. We present measurements of the thermal expansion from 200 K to about 1.6 K. We find evidence for stress effects at both high and low temperatures. The coefficient of volumetric thermal expansion and the Grüneisen parameter exhibit power-law temperature dependences above 12 K. The Grüneisen parameter changes sign near 2.4 K and reaches +160 by 1.6 K. Our results are consistent with predictions of Grüneisen divergence on the ordered side of a quantum critical point.

Department(s)

Physics, Astronomy, and Materials Science

Document Type

Article

DOI

https://doi.org/10.1080/14786435.2018.1549369

Keywords

Grüneisen divergence, Grüneisen parameter, Quantum critical point, Quantum criticality, Thermal expansion

Publication Date

1-1-2019

Journal Title

Philosophical Magazine

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