2003/09/29 by Kazumi Maki, Hyekyung Won, Stephan Haas · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Rare-earth and actinide compounds #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.012502
8 pages, RevTex, 4 figures
arxiv created 2003/09/29 · openalex publication_date 2004/01/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recent experiments on single crystals of YNi2B2C have revealed the presence of point nodes in the superconducting energy gap \ensuremathΔ(k) at \mathrmk\ifmmode \else \\fi=(1,0,0),(0,1,0),(\ensuremath-1,0,0), and (0,\ensuremath-1,0). In this paper we investigate the effects of impurity scattering on the quasiparticle spectrum in the vortex state of s+g-wave superconductors, which is found to be strongly modified in the presence of disorder. In particular, a gap in the quasiparticle energy spectrum is found to open even for infinitesimal impurity scattering, giving rise to exponentially activated thermodynamic response functions, such as the specific heat, the spin susceptibility, the superfluid density, and the nuclear spin lattice relaxation. Predictions derived from this study can be verified by measurements of the angular dependent magnetospecific heat and the magnetothermal conductivity.