Figure 5. Superconducting properties of LuPdBi single crystal.

(a) The upper critical field B_c2, determined as the vanishing point of the superconducting state (inset), was plotted with the reduced transition temperature t = T/Tc. The blue solid line shows the Ginzburg-Landau (G-L) fit to the data and the dotted green line represents the WHH theoretical curve. Inset: temperature dependence of resistance under different applied magnetic fields. (b) Temperature dependent electronic specific heat c_e under zero field after subtracting the phonon contribution based on the Debye fit of the normal state (indicated by the inset). The red solid line represents the calculated c_e/T curve given by strong-coupling BCS theory with α = Δ(0)/k_BT_c = 2.6, Δ(0) = 0.32 meV, T_c = 1.45 K. Inset: c_p/T versus T under 0 and 3T magnetic fields. The 3T magnetic field is larger enough to quench superconductivity, therefore the 3T curve represent the normal state of the material.