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

S. Tsuda, Takayoshi 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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Abstract

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
Volume75
Issue number6
DOIs
Publication statusPublished - Jun 2006

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Keywords

  • High-resolution photoemission
  • Skutterudite
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Tsuda, S., Yokoya, T., Kiss, T., Shimojima, T., Shin, S., Togasi, T., Watanabe, S., Zhang, C. Q., Chen, C. T., Sugawara, H., Sato, H., & Harima, H. (2006). Superconducting gap of filled skutterudite superconductor LaRu 4P12 studied by sub-meV resolution photoemission spectroscopy. Journal of the Physical Society of Japan, 75(6), [064711]. https://doi.org/10.1143/JPSJ.75.064711