Superconductivity in W5SiB2 with the T 2-phase structure studied by the specific heat measurement and band structure calculation

M. Fukuma; K. Kawashima; M. Maruyama; J. Akimitsu

doi:10.1016/j.physc.2011.05.035

Superconductivity in W₅SiB₂ with the T ₂-phase structure studied by the specific heat measurement and band structure calculation

M. Fukuma, K. Kawashima, M. Maruyama, J. Akimitsu

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The superconducting state of W₅SiB₂ with the T ₂-phase structure has been investigated by a specific heat measurement and a density of state calculation. The estimated ΔC _p/γT_c and 2Δ(0)/k_BT_c values are 1.49 and 3.32, which are close to 1.43 and 3.53 within the weak coupling regime. The electronic specific heat data clearly indicates the absence of gap nodes in the superconducting order parameter, suggesting an isotropic s-wave superconductor. From the density of state calculations, we found that W d-orbital plays an important role for the superconductivity in W ₅SiB₂.

Original language	English
Pages (from-to)	714-716
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	471
Issue number	21-22
DOIs	https://doi.org/10.1016/j.physc.2011.05.035
Publication status	Published - Nov 2011
Externally published	Yes

Keywords

DOS
Specific heat
Superconductor
WSiB

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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@article{43ffbd8791884a44b167106d64111ec7,

title = "Superconductivity in W5SiB2 with the T 2-phase structure studied by the specific heat measurement and band structure calculation",

abstract = "The superconducting state of W5SiB2 with the T 2-phase structure has been investigated by a specific heat measurement and a density of state calculation. The estimated ΔC p/γTc and 2Δ(0)/kBTc values are 1.49 and 3.32, which are close to 1.43 and 3.53 within the weak coupling regime. The electronic specific heat data clearly indicates the absence of gap nodes in the superconducting order parameter, suggesting an isotropic s-wave superconductor. From the density of state calculations, we found that W d-orbital plays an important role for the superconductivity in W 5SiB2.",

keywords = "DOS, Specific heat, Superconductor, WSiB",

author = "M. Fukuma and K. Kawashima and M. Maruyama and J. Akimitsu",

note = "Funding Information: This work was partially supported by a Grant-in-Aid for Science Research, Grant-in-Aid for Specially Promoted Research, and a High-Tech Research Center Project for private university from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.",

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AU - Fukuma, M.

AU - Kawashima, K.

AU - Maruyama, M.

AU - Akimitsu, J.

N1 - Funding Information: This work was partially supported by a Grant-in-Aid for Science Research, Grant-in-Aid for Specially Promoted Research, and a High-Tech Research Center Project for private university from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

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AB - The superconducting state of W5SiB2 with the T 2-phase structure has been investigated by a specific heat measurement and a density of state calculation. The estimated ΔC p/γTc and 2Δ(0)/kBTc values are 1.49 and 3.32, which are close to 1.43 and 3.53 within the weak coupling regime. The electronic specific heat data clearly indicates the absence of gap nodes in the superconducting order parameter, suggesting an isotropic s-wave superconductor. From the density of state calculations, we found that W d-orbital plays an important role for the superconductivity in W 5SiB2.

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