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

doi:10.1103/PhysRevLett.94.057001

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

DOI 10.1103/PhysRevLett.94.057001 · Physical Review Letters

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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 CeRu2, and also demonstrates the potential of Laser-PES in investigating unconventional superconductivity realized in correlated d- and f-electron superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeRu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.2	Pressure not reported	unknown
CeRu2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.2	Pressure not reported	onset