Comparative photoemission studies on the superconducting gap of the filled skutterudite superconductors LaPt₄Ge₁₂ and PrPt₄Ge₁₂

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概要

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• We performed a comparative study of the superconducting gap in the new filled skutterudite superconductors LaPt₄Ge₁₂ and PrPt₄Ge₁₂ using high-resolution photoemission spectroscopy. We succeeded in observing spectral changes across Tc 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 PrPt₄Ge₁₂. In addition, we found that the two-gap model is more suitable for describing the superconducting-state spectrum of PrPt₄Ge₁₂ 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 PrPt₄Ge₁₂.

• 2012-07-26

著者

• OKAZAKI Hiroyuki

  The Graduate School of Natural Science and Technology, Okayama University

• Okazaki Hiroyuki

  The Graduate School of Science and Technology, Okayama University, Okayama 700-8530, Japan

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