Author/Authors :
Ishizaki، نويسنده , , Y. and Uozaki، نويسنده , , H. and Tsuchiya، نويسنده , , H. and Abe، نويسنده , , Y. and Negishi، نويسنده , , E. and Matsui، نويسنده , , H. and Endo، نويسنده , , Anil S. and Toyota، نويسنده , , N.، نويسنده ,
Abstract :
We have measured the specific heat of λ-(BEDT-TSF)2GaCl4 by a thermal relaxation method below 7 K to study the superconducting state. The specific heat jump due to the superconducting transition at Tc=4.8 K is observed. For the normal state, we have determined the electronic specific heat coefficient γ=14.4±3.4 mJ/mol K2 and the Debye temperature of ΘD=194.0±0.4 K. The discontinuity of the specific heat is evaluated to be ΔC/γTc=1.37±0.32, which coincides with a Bardeen–Cooper–Schrieffer (BCS) relation ΔC/γTc=1.43 for a weak-coupling limit. The zero-crossing (ΔC=0) occurs at 0.67Tc, which has been similarly observed in BEDT-TTF-based superconductors.
Keywords :
specific heat , ?-(BEDT-TSF)2GaCl4 , superconductor , Weak-coupling superconductivity
