2001/08/31 by L. Tewordt, D. Fay
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.65.104510
5 pages, 6 figures, replaced in non-preprint form, to appear in Phys. Rev. B
arxiv created 2001/12/13 · openalex publication_date 2002/02/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the ultrasonic attenuation in magnetic fields for superconducting states with line nodes vertical or horizontal relative to the RuO2 planes. This theory, which is valid for fields near Hc2 and not too low temperatures, takes into account the effects of supercurrent flow and Andreev scattering by the Abrikosov vortex lattice. For rotating in-plane field H(\ensuremathΘ) the attenuation \ensuremathα(\ensuremathΘ) exhibits variations of fourfold symmetry in the rotation angle \ensuremathΘ. In the case of vertical nodes, the transverse T100 sound mode yields the weakest (linear) H and T dependence of \ensuremathα, while the longitudinal L100 mode yields a stronger (quadratic) H and T dependence. This is in strong contrast to the case of horizontal line nodes where \ensuremathα is the same for the T100 and L100 modes (apart from a shift of \ensuremathπ/4 in field direction) and is roughly a quadratic function of H and T. Thus we conclude that measurements of \ensuremathα in in-plane magnetic fields for different in-plane sound modes may be an important tool for probing the nodal structure of the gap in Sr2RuO4.