CRITICAL MAGNETIC FIELD IN CeCoIn₅ SUPERCONDUCTOR

Abstract

We investigate the superconducting transition temperature, Tc in the presence of the magnetic field, H in CeCoIn 5. It is shown that phonon-enhanced spin fluctuations drive this superconductivity once more as suggested by us (Phys. Rev.B61, 4289). We know the magnetic dependence of our transition temperature is in good correspondence with experimental data. It is elucidated that the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) superconducting states are closely related to the temperature gradient contributed by the external magnetic field.