TY - JOUR
T1 - Thermodynamic properties and pressure effect on the superconductivity in CaAlSi and SrAlSi
AU - Lorenz, B.
AU - Cmaidalka, J.
AU - Meng, L.
AU - Chu, W.
PY - 2003
Y1 - 2003
N2 - Superconductivity in the C32 compounds CaAlSi and SrAlSi is investigated by heat capacity measurements as well as high-pressure ac-susceptibility experiments. The heat capacity in the superconducting state is well explained by the BCS theory for weak (SrAlSi) and enhanced coupling strength (CaAlSi). The magnitudes of the superconducting gaps are estimated as 2.7 meV (CaAlSi) and 1.4 meV (SrAlSi). The pressure effect on the superconducting transition temperature, dlnTc/dp, is positive in CaAlSi (+0.026 GPa-1) but negative in SrAlSi (-0.024 GPa-1). The opposite sign of the pressure coefficients of Tc indicates distinct differences in the electronic structure and the density of states at the Fermi energy of the two compounds in agreement with recent band structure calculations.
AB - Superconductivity in the C32 compounds CaAlSi and SrAlSi is investigated by heat capacity measurements as well as high-pressure ac-susceptibility experiments. The heat capacity in the superconducting state is well explained by the BCS theory for weak (SrAlSi) and enhanced coupling strength (CaAlSi). The magnitudes of the superconducting gaps are estimated as 2.7 meV (CaAlSi) and 1.4 meV (SrAlSi). The pressure effect on the superconducting transition temperature, dlnTc/dp, is positive in CaAlSi (+0.026 GPa-1) but negative in SrAlSi (-0.024 GPa-1). The opposite sign of the pressure coefficients of Tc indicates distinct differences in the electronic structure and the density of states at the Fermi energy of the two compounds in agreement with recent band structure calculations.
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U2 - 10.1103/PhysRevB.68.014512
DO - 10.1103/PhysRevB.68.014512
M3 - Article
AN - SCOPUS:0141540557
SN - 1098-0121
VL - 68
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 1
ER -