Gap Function with Point Nodes in Borocarbide Superconductor [Formula presented]

K. Izawa, K. Kamata, Y. Nakajima, Y. Matsuda, T. Watanabe, M. Nohara, H. Takagi, P. Thalmeier, K. Maki

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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 languageEnglish
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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