"Symmetry constraints on the elastoresistivity tensor"

M. C. Shapiro: Patrik Hlobil, A. T. Hristov, Akash V. Maharaj, and I. R. Fisher; Physical Review B, 12/28/15.

Additional Authors: Patrik Hlobil, A. T. Hristov, Akash V. Maharaj, and I. R. Fisher

Abstract:

The elastoresistivity tensor mij,kl characterizes changes in a material’s resistivity due to strain. As a fourth-rank tensor, elastoresistivity can be a uniquely useful probe of the symmetries and character of the electronic state of a solid. We present a symmetry analysis of mij,kl (both in the presence and absence of a magnetic field) based on the crystalline point group, focusing for pedagogic purposes on the D4h point group (of relevance to several materials of current interest). We also discuss the relation between mij,kl and various thermodynamic susceptibilities, particularly where they are sensitive to critical fluctuations proximate to a critical point at which a point-group symmetry is spontaneously broken.