The specific heat C and the electronic and phononic thermal conductivities e and ph were calculated in the mixed state for magnetic fields H near HC2, including the effects of supercurrent flow and Andreev scattering. The resulting function C(H) was nearly linear while e(H) exhibited an upward curvature near HC2. The slopes decrease with impurity scattering which improves the agreement with the data on MgB2. The ratio of phonon relaxation times (n)/(s) = g((0),H) for phonon energy (0) was smeared out around (0) = 2 and tends to unity with increasing H. This led to a rapid reduction of ph(H) in MgB2 for relatively small fields due to the rapid suppression of the smaller energy gap.

Specific Heat and Thermal Conductivity in the Mixed State of MgB2. L.Tewordt, D.Fay: Physical Review Letters, 2002, 89[13], 137003 (3pp)