Study of vortex state in magnesium diboride superconductors -A vortex matter phase diagram originating from two superconducting gap

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We studied the vortex matter phase diagram in MgB2, which has been known as a typical two-gap superconductor, and the impurity effect on it. In addition to clarifying the universal characteristics of vortex phase transitions, which have been remarkably observed in high-Tc cuprate superconductors, we found a new type of transition in the vortex state and a modulation of the phase diagram due to Al substitution, which were considered to be peculiar to this system. We also succeeded in measuring the two kinds of gap energies in Ba(Fe0.93Co0.07)2As2, which is related materials of MgB2.