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/molK2 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 0.67 Tc, which has been similarly observed in BEDT-TTF-based superconductors.
- Specific heat
- Weak-couplin g superconductivity