Superconductivity in Ba(TM,Si) 2 (TM = Pd, Pt, Cu, Ag, and Au) with the AlB 2-type structure

Kenji Kawashima; Keigo Inoue; Takuya Ishikawa; Michinori Fukuma; Masaaki Yoshikawa; Jun Akimitsu

doi:10.1143/JPSJ.81.114717

Superconductivity in Ba(TM,Si) ₂ (TM = Pd, Pt, Cu, Ag, and Au) with the AlB ₂-type structure

Kenji Kawashima, Keigo Inoue, Takuya Ishikawa, Michinori Fukuma, Masaaki Yoshikawa, Jun Akimitsu

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

3 Citations (Scopus)

Abstract

We succeeded in synthesizing BaTM _xSi _2-x (TM = Pd, Pt, Cu, Ag, and Au) superconductors with the AlB ₂-type structure and performed detailed thermodynamic measurements of the superconducting state in BaTM _xSi _2-x to determine the superconducting parameters [H _c1(0), H _c2(0), λ(0), ξ(0), and K _GL] using Ginzburg-Landau relations. The observed parameters indicated that BaTM _xSi _2-x can be categorized into a conventional type-II superconductor. The AlB2-type structure appears at x between 0.2 and 0.8, and the lattice parameters systematically changed with x. The superconductivity was observed at a TM concentration x = 0.2-0.6. T _c was almost constant between x = 0:2 and 0.3 and observed to decrease with increasing TM concentration (0.3 ≤ x ≤ 0.6). The specific heat data indicated that the superconductivity in BaTM _xSi _2-x exists in a weak coupling regime in the BCS theory. Moreover, we discussed the role of the TM element in BaTM _xSi _2-x using the observed data.

Original language	English
Article number	114717
Journal	journal of the physical society of japan
Volume	81
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.81.114717
Publication status	Published - Nov 2012
Externally published	Yes

Keywords

AlB -type
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.81.114717

Cite this

@article{d084bd66cbb949d7927200d48148c295,

title = "Superconductivity in Ba(TM,Si) 2 (TM = Pd, Pt, Cu, Ag, and Au) with the AlB 2-type structure",

abstract = "We succeeded in synthesizing BaTM xSi 2-x (TM = Pd, Pt, Cu, Ag, and Au) superconductors with the AlB 2-type structure and performed detailed thermodynamic measurements of the superconducting state in BaTM xSi 2-x to determine the superconducting parameters [H c1(0), H c2(0), λ(0), ξ(0), and K GL] using Ginzburg-Landau relations. The observed parameters indicated that BaTM xSi 2-x can be categorized into a conventional type-II superconductor. The AlB2-type structure appears at x between 0.2 and 0.8, and the lattice parameters systematically changed with x. The superconductivity was observed at a TM concentration x = 0.2-0.6. T c was almost constant between x = 0:2 and 0.3 and observed to decrease with increasing TM concentration (0.3 ≤ x ≤ 0.6). The specific heat data indicated that the superconductivity in BaTM xSi 2-x exists in a weak coupling regime in the BCS theory. Moreover, we discussed the role of the TM element in BaTM xSi 2-x using the observed data.",

keywords = "AlB -type, Superconductivity",

author = "Kenji Kawashima and Keigo Inoue and Takuya Ishikawa and Michinori Fukuma and Masaaki Yoshikawa and Jun Akimitsu",

year = "2012",

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T1 - Superconductivity in Ba(TM,Si) 2 (TM = Pd, Pt, Cu, Ag, and Au) with the AlB 2-type structure

AU - Kawashima, Kenji

AU - Inoue, Keigo

AU - Ishikawa, Takuya

AU - Fukuma, Michinori

AU - Yoshikawa, Masaaki

AU - Akimitsu, Jun

PY - 2012/11

Y1 - 2012/11

N2 - We succeeded in synthesizing BaTM xSi 2-x (TM = Pd, Pt, Cu, Ag, and Au) superconductors with the AlB 2-type structure and performed detailed thermodynamic measurements of the superconducting state in BaTM xSi 2-x to determine the superconducting parameters [H c1(0), H c2(0), λ(0), ξ(0), and K GL] using Ginzburg-Landau relations. The observed parameters indicated that BaTM xSi 2-x can be categorized into a conventional type-II superconductor. The AlB2-type structure appears at x between 0.2 and 0.8, and the lattice parameters systematically changed with x. The superconductivity was observed at a TM concentration x = 0.2-0.6. T c was almost constant between x = 0:2 and 0.3 and observed to decrease with increasing TM concentration (0.3 ≤ x ≤ 0.6). The specific heat data indicated that the superconductivity in BaTM xSi 2-x exists in a weak coupling regime in the BCS theory. Moreover, we discussed the role of the TM element in BaTM xSi 2-x using the observed data.

AB - We succeeded in synthesizing BaTM xSi 2-x (TM = Pd, Pt, Cu, Ag, and Au) superconductors with the AlB 2-type structure and performed detailed thermodynamic measurements of the superconducting state in BaTM xSi 2-x to determine the superconducting parameters [H c1(0), H c2(0), λ(0), ξ(0), and K GL] using Ginzburg-Landau relations. The observed parameters indicated that BaTM xSi 2-x can be categorized into a conventional type-II superconductor. The AlB2-type structure appears at x between 0.2 and 0.8, and the lattice parameters systematically changed with x. The superconductivity was observed at a TM concentration x = 0.2-0.6. T c was almost constant between x = 0:2 and 0.3 and observed to decrease with increasing TM concentration (0.3 ≤ x ≤ 0.6). The specific heat data indicated that the superconductivity in BaTM xSi 2-x exists in a weak coupling regime in the BCS theory. Moreover, we discussed the role of the TM element in BaTM xSi 2-x using the observed data.

KW - AlB -type

KW - Superconductivity

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