### Abstract

To determine the superconducting gap function of [Formula presented], the [Formula presented]-axis thermal conductivity [Formula presented] was measured in [Formula presented] rotated in various directions. The angular variation of [Formula presented] in [Formula presented] rotated within the [Formula presented] plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when [Formula presented] is rotated conically around the [Formula presented] axis with a tilt angle of 45°. These results provide the first compelling evidence that the gap function has point nodes located along the [Formula presented] and [Formula presented] axes. This unprecedented gap structure challenges the current view on the pairing mechanism.

Original language | English |
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Journal | Physical Review Letters |

Volume | 89 |

Issue number | 13 |

DOIs | |

Publication status | Published - Jan 1 2002 |

Externally published | Yes |

### ASJC Scopus subject areas

- Physics and Astronomy(all)

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## Cite this

*Physical Review Letters*,

*89*(13). https://doi.org/10.1103/PhysRevLett.89.137006