Pressure Effects on Two-Band Conduction and Superconductivity in C- and Al-Substituted MgB2 Single Crystals

Pressure effects on resistivity, T c , and H c2 for pure, and C- and Al-substituted MgB 2 single crystals are reported. While the suppression behavior of T c [Δ T c / T c (0)] does not markedly differ among the samples, a large difference is seen in the suppression of the resistivity slope at high temperatures. This suggests that the strength of interband scattering differs between C- and Al-substituted samples.