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
Recommended Citation
Bhandia, R., T. Siegrist, T. Besara, and G. M. Schmiedeshoff. "Grüneisen divergence near the structural quantum phase transition in ScF3." Philosophical Magazine 99, no. 5 (2019): 631-643.
Journal Title
Philosophical Magazine
