ABSTRACT
The cubic perovskite ScF 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
by 1.6 K. Our results are consistent with predictions of Grüneisen divergence on the ordered side of a quantum critical point.
Acknowledgments
We thank A. Grockowiak and J. C. Cooley for calling our attention to ScF and for helpful discussions, we also thank S. L. Bud'ko and P. C. Canfield for helpful discussions.
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
T. Besara http://orcid.org/0000-0002-2143-2254