Specific heat and de haas-van alphen experiments on the heavy-fermion superconductor CePt3Si

Specific heat and de Haas–van Alphen (dHvA) measurements were performed on a high-quality single crystal of CePt 3 Si without inversion symmetry in the tetragonal crystal structure. We observed distinct peaks in the specific heat C at the superconducting transition temperature T c =0.46 K and the antiferromagnetic ordering temperature T N =2.25 K, compared to the previous data, indicating an improvement of the sample quality. The temperature dependence of the electronic specific heat coefficient C e / T below about 0.3 K is well described by the equation of C e / T =γ s +β s T with γ s =34.1 mJ/(K 2 ·mol) and β s =1290 mJ/(K 3 ·mol), evidencing the existence of line nodes in the superconducting energy gap. Furthermore, the electronic specific heat coefficient γ s in the superconducting state indicates a nonlinear magnetic field dependence \(\gamma_{\text{s}}(H)\propto\sqrt{H}\), which also supports the presence of line nodes. We did not observe a discontinuous change of the Fermi surface at P AF =0.6 GPa ...