Unusual behaviours and Impurity Effects in the Noncentrosymmetric Superconductor CePt3Si

Abstract

We report a study in which the effect of defects/impurities, growth process, off-stoichiometry, and presence of impurity phases on the superconducting properties of noncentrosymmetric CePt3Si is analysed by means of the temperature dependence of the magnetic penetration depth. We found that the linear low-temperature response of the penetration depth -indicative of line nodes in this material- is robust regarding sample quality, in contrast to what is observed in unconventional centrosymmetric superconductors with line nodes. We discuss evidence that the broadness of the superconducting transition may be intrinsic, though not implying the existence of a second superconducting transition. The superconducting transition temperature systematically occurs around 0.75 K in our measurements, in agreement with resistivity and ac magnetic susceptibility data but in conflict with specific heat, thermal conductivity and NMR data in which Tc is about 0.5 K. Random defects do not change the linear low-temperature dependence of the penetration depth in the heavy-fermion CePt3Si with line nodes, as they do in unconventional centrosymmetric superconductors with line nodes.

To appear in New Journal of Physics

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• Superconductivity and quantum criticality in heavy fermions CeIrSi${}_3$ and CeRhSi${}_3$
• Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors
• Surface instability in nodal noncentrosymmetric superconductors
• Edge currents as a probe of the strongly spin-polarized topological noncentrosymmetric superconductors
• Non-Centrosymmetric Heavy-Fermion Superconductors
• Absence of spin-orbit-coupling-induced effects on lattice dynamics in CePt3Si
• Superconductivity in W3Re2C with chiral structure