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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jul 26 2012|
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials