Fig. 1: Optical detection of shear strain.
From: Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
a Photo of a thin Sr2RuO4 crystal (dimensions 0.8 × 0.5 × 0.03 mm3, sample S4) attached onto the active side surface of a shear piezo device (dimensions 2.2 × 0.5 × 2.2 mm3) and corresponding schematics. b Optical microscope image of the Sr2RuO4 sample (black) on the shear piezo surface with 200 V applied at room temperature. The point-by-point horizontal displacement ux is represented by the coloured dots, while the arrows schematically indicate the in-plane shear strain. c Direct optical measurement of shear strain on the piezo device (crosses) and Sr2RuO4 (circles) at two selected temperatures. d Magnitude of shear at 100 V and e amount of shear transferred to the Sr2RuO4 sample as a function of temperature. The dashed lines are polynomial guides to the eye.
