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

Naoki Kase; Jim Akimitsu

doi:10.1143/JPSJ.78.044710

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

Naoki Kase, Jim Akimitsu

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

26 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 language	English
Article number	044710
Journal	journal of the physical society of japan
Volume	78
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.78.044710
Publication status	Published - Apr 2009
Externally published	Yes

Keywords

No inversion symmetry
Ru B
Specific heat
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.044710

Cite this

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title = "Superconducting state of the binary boride Ru 7B 3 with the noncentrosymmetric crystal structure",

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.",

keywords = "No inversion symmetry, Ru B, Specific heat, Superconductivity",

author = "Naoki Kase and Jim Akimitsu",

year = "2009",

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journal = "Journal of the Physical Society of Japan",

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TY - JOUR

T1 - Superconducting state of the binary boride Ru 7B 3 with the noncentrosymmetric crystal structure

AU - Kase, Naoki

AU - Akimitsu, Jim

PY - 2009/4

Y1 - 2009/4

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.

KW - No inversion symmetry

KW - Ru B

KW - Specific heat

KW - Superconductivity

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