Superconductivity and Physical Properties of CaPd2Ge2 Single Crystals
Abstract
We present the superconducting and normal state properties of CaPd2Ge2 single crystal investigated by magnetic susceptibility , isothermal magnetization M, heat capacity Cp, in-plane electrical resistivity and London penetration depth λ versus temperature T and magnetic field H measurements. Bulk superconductivity is inferred from the (T) and Cp(T) data. The (T) data exhibit metallic behavior and undergoes a superconducting transition with Tc onset = 1.98 K and zero resistivity state at Tc 0 = 1.67 K. The (T) reveal the onset of superconductivity at 2.0 K. For T>2.0 K, the (T) and M(H) are weakly anisotropic paramagnetic with ab > c. The Cp(T) confirm the bulk superconductivity below Tc = 1.69(3) K. The superconducting state electronic heat capacity is analyzed within the framework of a single-band α-model of BCS superconductivity and various normal and superconducting state parameters are estimated. Within the α-model, the Cp(T) data and the ab plane λ(T) data consistently indicate a moderately anisotropic s-wave gap with (0)/kB Tc ~ 1.6, somewhat smaller than the BCS value of 1.764. The relationship of the heat capacity jump at Tc and the penetration depth measurement to the anisotropy in the s-wave gap is discussed.
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