Pressure effects on two-band conduction and superconductivity in C-and Al-substituted MgB_2 single crystals

摘要

Pressure effects on resistivity, T_c, and H_(c2) for pure, and C-and Al-substituted MgB2 single crystals are reported. While the suppression behavior of T_c [ΔT_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.