Comparative photoemission studies on the superconducting gap of the filled skutterudite superconductors LaPt 4Ge 12 and PrPt 4Ge 12

Yoshiaki Nakamura, Hiroyuki Okazaki, Rikiya Yoshida, Takanori Wakita, Hiroyuki Takeya, Kazuto Hirata, Masaaki Hirai, Yuji Muraoka, Takayoshi Yokoya

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    19 Citations (Scopus)

    Abstract

    We performed a comparative study of the superconducting gap in the new filled skutterudite superconductors LaPt 4Ge 12 and PrPt 4Ge 12 using high-resolution photoemission spectroscopy. We succeeded in observing spectral changes across T c that reflect the opening of the superconducting gap in both compounds and also in observing a noticeable difference in their respective superconducting spectral shapes near the Fermi level, pointing toward a more complex superconducting gap structure in PrPt 4Ge 12. In addition, we found that the two-gap model is more suitable for describing the superconducting-state spectrum of PrPt 4Ge 12 than the single-isotropic-gap and single-anisotropic-gap models, which suggests an explanation that multiband effects may possibly induce the anomalous superconducting properties of PrPt 4Ge 12.

    Original languageEnglish
    Article number014521
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number1
    DOIs
    Publication statusPublished - 2012 Jul 26

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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