Superconducting state of the binary boride Ru 7B 3 with the noncentrosymmetric crystal structure

Naoki Kase, Jim Akimitsu

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23 Citations (Scopus)


Single crystals of Ru 7B 3 were grown by the Czochralski puling method in a tetra-arc furnace. The compound crystallizes in a Th 7Fe 3-type structure (hexagonal, space group: P6 3, mc), which has no inversion symmetry along the oaxis. Measurements in magnetic fields indicate type-II superconductivity with upper critical fields of H c2(0) ≃ 17.2kOe for H &par [001] and 15.8kOe for H &par [100], respectively. The coherence length ξ(0) GL, penetration depth λ(0)GL, and Ginzburg-Landau (GL) parameter κ(0) obtained from these values are 144Å, 3U0Å, and 21.6 for H ∥ [100], and 138 Å, 3520Å, and 25.5 for H &par [001], respectively. Specific heat measurements reveal that Ru 7B 3 is a weak-coupling superconductor with an isotropic superconducting gap.

Original languageEnglish
Article number044710
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - Apr 2009
Externally publishedYes


  • No inversion symmetry
  • Ru B
  • Specific heat
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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