Superconductivity in W 5SiB 2 with the T 2 phase structure

Michinori Fukuma, Kenji Kawashima, Masaki Maruyama, Jun Akimitsu

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report here the superconducting properties of W 5SiB 2. W5SiB 2 has a T 2 phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W 5SiB 2 is a superconductor with a transition temperature (T c) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field H c1(0) and upper critical field H c2(0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg-Landau (GL) equations. The estimated Sommerfeld coefficient γ N is 12.8 mJ/(molK 2). The normalized specific heat jump ΔC/γ NT c is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., ΔC/γ NT c = 1:43. This finding indicates that superconductivity in W 5SiB 2 exists within the week-coupling regime.

Original languageEnglish
Article number024702
JournalJournal of the Physical Society of Japan
Volume80
Issue number2
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

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superconductivity
specific heat
BCS theory
Landau-Ginzburg equations
penetration
transition temperature
magnetic permeability
magnetization
electrical resistivity
curves
coefficients
magnetic fields

Keywords

  • Superconductivity
  • T phase
  • W SiB

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Superconductivity in W 5SiB 2 with the T 2 phase structure. / Fukuma, Michinori; Kawashima, Kenji; Maruyama, Masaki; Akimitsu, Jun.

In: Journal of the Physical Society of Japan, Vol. 80, No. 2, 024702, 02.2011.

Research output: Contribution to journalArticle

Fukuma, Michinori ; Kawashima, Kenji ; Maruyama, Masaki ; Akimitsu, Jun. / Superconductivity in W 5SiB 2 with the T 2 phase structure. In: Journal of the Physical Society of Japan. 2011 ; Vol. 80, No. 2.
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