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

Naoki Kase, Jun Akimitsu

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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
Volume78
Issue number4
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

Fingerprint

borides
Czochralski method
furnaces
heat measurement
superconductivity
penetration
arcs
specific heat
inversions
crystal structure
single crystals
symmetry
magnetic fields

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Superconducting state of the binary boride Ru 7B 3 with the noncentrosymmetric crystal structure. / Kase, Naoki; Akimitsu, Jun.

In: Journal of the Physical Society of Japan, Vol. 78, No. 4, 044710, 04.2009.

Research output: Contribution to journalArticle

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abstract = "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 144{\AA}, 3U0{\AA}, and 21.6 for H ∥ [100], and 138 {\AA}, 3520{\AA}, 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.",
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N2 - 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.

AB - 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.

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