2004/05/27 by Hiroaki Kusunose · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.73.2512
published as J. Phys. Soc. Jpn. Vol. 73 2512 (2004) · 7 pages, 11 figures in JPSJ format
arxiv created 2004/05/27 · openalex publication_date 2004/09/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We discuss influence of modulation of gap function and anisotropy of Fermi velocity to field angle dependences of upper critical field, Hc2, and specific heat, C, on the basis of the approximate analytic solution in the quasiclassical formalism. Using 4-fold modulation of the gap function and the Fermi velocity in the single-band model, we demonstrate field and temperature dependence of oscillatory amplitude of Hc2 and C. We apply the method to the effective two-band model to discuss the gap structure of Sr2RuO4, focusing on recent field angle-resolved experiments. It is shown that the gap structures with the intermediate magnitude of minima in [100] direction for γ band, and tiny minima of gaps in [110] directions for α and β bands give consistent behaviors with experiments. The interplay of the above two gaps also explains the anomalous temperature dependence of in-plane Hc2 anisotropy, where the opposite contribution from the passive αβ band is pronounced near Tc.