Photoemission spectroscopic evidence of gap anisotropy in an f-electron superconductor

T. Kiss, F. Kanetaka, T. Yokoya, T. Shimojima, K. Kanai, S. Shin, Y. Onuki, T. Togashi, C. Zhang, C. T. Chen, S. Watanabe

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166 Citations (Scopus)

Abstract

We used low-temperature ultrahigh-resolution (360 μeV) photoemission spectroscopy with a laser as a photon source (Laser-PES) to study the superconducting (SC) gap of an f-electron superconductor CeRu2. The unique combination of the large escape depth expected from the known universal behavior and extremely high-energy resolution has enabled us to directly measure the bulk SC gap of an f-electron superconductor for the first time. The present study provides direct evidence for an anisotropic SC gap in C eRu2, and also demonstrates the potential of Laser-PES in investigating unconventional superconductivity realized in correlated d- and f-electron superconductors.

Original languageEnglish
Article number057001
JournalPhysical Review Letters
Volume94
Issue number5
DOIs
Publication statusPublished - Feb 11 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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