Evidence for line nodes in the superconducting energy gap of noncentrosymmetric CePt3Si from magnetic penetration depth measurements.

@article{Bonalde2005EvidenceFL,
  title={Evidence for line nodes in the superconducting energy gap of noncentrosymmetric CePt3Si from magnetic penetration depth measurements.},
  author={I. Bonalde and Werner Br{\"a}mer-Escamilla and Ernst Bauer},
  journal={Physical review letters},
  year={2005},
  volume={94 20},
  pages={207002}
}
We report measurements of the magnetic penetration depth lambda(T) in high-quality CePt3Si samples down to 0.049 K. We observe a linear temperature dependence below T approximately equal to 0.16Tc, which is interpreted as evidence for line nodes in the energy gap of the low-temperature phase of this material. A kink in lambda(T) at about 0.53 K may be associated with the second superconducting transition recently reported. The results are discussed in terms of the symmetry of the… CONTINUE READING