Superconductivity in W5SiB2 with the T2 phase structure

Michinori Fukuma, Kenji Kawashima, Masaki Maruyama, Jun Akimitsu

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18 Citations (Scopus)


We report here the superconducting properties of W5SiB 2. W5SiB2 has a T2 phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W5SiB2 is a superconductor with a transition temperature (Tc) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field Hc1(0) and upper critical field Hc2(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 γN is 12.8 mJ/(molK2). The normalized specific heat jump ΔC/γNTc 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/γNTc = 1:43. This finding indicates that superconductivity in W5SiB 2 exists within the week-coupling regime.

Original languageEnglish
Article number024702
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - Feb 2011
Externally publishedYes


  • Superconductivity
  • T phase
  • WSiB

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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