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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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
Issue number1
Publication statusPublished - Jul 26 2012


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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