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

Research output: Contribution to journalArticle

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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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photoelectric emission
spectroscopy
BCS theory
ultraviolet lasers
light sources
transition temperature
wave functions
spectrometers
vacuum
temperature dependence

Keywords

  • High-resolution photoemission
  • Skutterudite
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Superconducting gap of filled skutterudite superconductor LaRu 4P12 studied by sub-meV resolution photoemission spectroscopy. / Tsuda, S.; Yokoya, Takayoshi; Kiss, T.; Shimojima, T.; Shin, S.; Togasi, T.; Watanabe, S.; Zhang, C. Q.; Chen, C. T.; Sugawara, H.; Sato, H.; Harima, H.

In: Journal of the Physical Society of Japan, Vol. 75, No. 6, 064711, 06.2006.

Research output: Contribution to journalArticle

Tsuda, S, Yokoya, T, Kiss, T, Shimojima, T, Shin, S, Togasi, T, Watanabe, S, Zhang, CQ, Chen, CT, 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, vol. 75, no. 6, 064711. https://doi.org/10.1143/JPSJ.75.064711
Tsuda, S. ; Yokoya, Takayoshi ; Kiss, T. ; Shimojima, T. ; Shin, S. ; Togasi, T. ; Watanabe, S. ; Zhang, C. Q. ; Chen, C. T. ; Sugawara, H. ; Sato, H. ; Harima, H. / Superconducting gap of filled skutterudite superconductor LaRu 4P12 studied by sub-meV resolution photoemission spectroscopy. In: Journal of the Physical Society of Japan. 2006 ; Vol. 75, No. 6.
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AU - Shimojima, T.

AU - Shin, S.

AU - Togasi, T.

AU - Watanabe, S.

AU - Zhang, C. Q.

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AU - Sugawara, H.

AU - Sato, H.

AU - Harima, H.

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