### Abstract

Superconducting properties in (Formula presented), with a transition temperature of (Formula presented) K, have been investigated by measurements of the nuclear spin-lattice relaxation rate, (Formula presented). It has been found that the (Formula presented) behavior, observed well below (Formula presented), arises from combined relaxation channels to vortex cores, as well as from a residual density of states (DOS), (Formula presented), at the Fermi level associated with the gapless superconductivity. From the value of (Formula presented) in the latter channel, the DOS fraction normalized by its value at (Formula presented), (Formula presented), has been deduced to be as small as ∼0.05. Based on the two-dimensional gapless (Formula presented)-wave model, the (Formula presented) reduction rate, (Formula presented), is estimated to be as small as 0.02 for (Formula presented). It is pointed out that these measures of the quality of (Formula presented) explain why (Formula presented) reaches such a high value.

Original language | English |
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Pages (from-to) | R8906-R8909 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 53 |

Issue number | 14 |

DOIs | |

Publication status | Published - Jan 1 1996 |

Externally published | Yes |

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

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## Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*53*(14), R8906-R8909. https://doi.org/10.1103/PhysRevB.53.R8906