Volovik effect in a highly anisotropic multiband superconductor: Experiment and theory

Article

关键词: HIGH MAGNETIC-FIELDS;    DENSITY-OF-STATES;    VORTEX LATTICE;    D-WAVE;    UNCONVENTIONAL SUPERCONDUCTORS;    TYPE-2 SUPERCONDUCTORS;    II SUPERCONDUCTORS;    HEAT;    TEMPERATURE;    SPECTRUM;   

DOI  :  10.1103/PhysRevB.84.184524

来源: SCIE

【 摘 要 】

We present measurements of the specific heat coefficient gamma (equivalent to C/T) in the low-temperature limit as a function of an applied magnetic field for the Fe-based superconductor BaFe2(As0.7P0.3)(2). We find both a linear regime at higher fields and a limiting square root H behavior at very low fields. The crossover from a Volovik-like root H to a linear field dependence can be understood from a multiband calculation in the quasiclassical approximation assuming gaps with different momentum dependence on the hole-and electronlike Fermi surface sheets.

【 授权许可】

Free