Heat capacity of mesoscopically disordered superconductors with emphasis on MgB2

摘要: The temperature dependence of the electronic heat capacity C(T) was calculated for a mesoscopically disordered s-wave superconductor treated as spatial ensemble domains with continuously varying superconducting properties. are assumed to have sizes \xi $>L > ?, where ? is coherence length. Each domain characterized by certain critical Tc0 in range [0, Tc ]. averaging over broad gap distribution leads T2 low T, whereas specific anomaly at substantially smeared. For narrow distributions there exists an intermediate-T range, curve can be well approximated exponential Bardeen?Cooper?Schrieffer-like effective smaller than weak-coupling value. results applicable general case inhomogeneous superconductors including, e.g., electron-doped and hole-doped cuprates. data MgB2, multiple gaps observed, discussed more detail.