Superconducting gap of filled skutterudite superconductor LaRu 4P12 studied by sub-meV resolution photoemission spectroscopy

S. Tsuda, T. Yokoya, T. Kiss, T. Shimojima, S. Shin, T. Togasi, S. Watanabe, C. Q. Zhang, C. T. Chen, H. Sugawara, H. Sato, H. Harima

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9 Citations (Scopus)


We study the superconducting gap of the filled skutterudite superconductor LaRu4P12 (transition temperature Tc = 7:2 K) using a newly developed sub-meV resolution photoemission spectrometer with a vacuum-UV laser as a light source. The result at 4.8K shows the opening of a superconducting gap, whose spectral shape is well explained with an isotropic s-wave Dynes function using a gap size of 1.3 meV. This corresponds to the reduced gap 2Δ(0)/kBTc of 4.2. The temperature dependence of the superconducting gap shows fairly good agreement with the conventional BCS theory. The present results are consistent with those of a moderately strong-coupling and isotropic s-wave superconductor.

Original languageEnglish
Article number064711
Journaljournal of the physical society of japan
Issue number6
Publication statusPublished - Jun 2006


  • High-resolution photoemission
  • Skutterudite
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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