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

doi:10.1143/JPSJ.75.064711

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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11 Citations (Scopus)

Abstract

We study the superconducting gap of the filled skutterudite superconductor LaRu₄P₁₂ (transition temperature T_c = 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)/k_BT_c 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 language	English
Article number	064711
Journal	journal of the physical society of japan
Volume	75
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.75.064711
Publication status	Published - Jun 2006

Keywords

High-resolution photoemission
Skutterudite
Superconducting gap

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.75.064711

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

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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.",

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author = "S. Tsuda and T. Yokoya and T. Kiss and T. Shimojima and S. Shin and T. Togasi and S. Watanabe and Zhang, {C. Q.} and Chen, {C. T.} and H. Sugawara and H. Sato and H. Harima",

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AU - Tsuda, S.

AU - Yokoya, T.

AU - Kiss, T.

AU - Shimojima, T.

AU - Shin, S.

AU - Togasi, T.

AU - Watanabe, S.

AU - Zhang, C. Q.

AU - Chen, C. T.

AU - Sugawara, H.

AU - Sato, H.

AU - Harima, H.

PY - 2006/6

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AB - 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.

KW - High-resolution photoemission

KW - Skutterudite

KW - Superconducting gap

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