Interference between Superconductivity and Martensitic Transition in A15 Compounds

Naoki Toyota; Tsukasa Kobayashi; Mitsuo Kataoka; Hirohide F.J. Watanabe; Tetsuo Fukase; Yoshio Muto; Fumihiko Takei

doi:10.1143/JPSJ.57.3089

Interference between Superconductivity and Martensitic Transition in A15 Compounds

Naoki Toyota, Tsukasa Kobayashi, Mitsuo Kataoka, Hirohide F.J. Watanabe, Tetsuo Fukase, Yoshio Muto, Fumihiko Takei

SCI - Physics

Research output: Contribution to journal › Article

20 Citations (Scopus)

Abstract

An interference effect between the high-T_c superconductivity and martensitic transition in A15 compounds such as V₃Si and Nb₃Sn has been studied. It is found from the measurements of the sound velocity, sound attenuation, thermal dilation and the electrical resistance, that an occurrence of superconductivity interferes drastically with the developing tetragonal distortions caused by the martensitic transformation, but the high-T_c superconductivity in these compounds is only weakly affected by the presence of the martensitic transition. This unilateral interference effect is qualitatively consistent with the second-order band Jahn-Teller mechanism which means the Fermi level crossing the upper split band of the doubly degenerate Γ₁₂ subbands. Discussions on T_c are given on the basis of the Fermi surface effect of Γ₁₂ subbands.

Original language	English
Pages (from-to)	3089-3101
Number of pages	13
Journal	journal of the physical society of japan
Volume	57
Issue number	9
DOIs	https://doi.org/10.1143/JPSJ.57.3089
Publication status	Published - 1988 Jan 1

Keywords

A15 compounds
band Jahn-Teller effect
high T superconductivity
martensitic transition
strong electron-phonon coupling

ASJC Scopus subject areas

Physics and Astronomy(all)

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Toyota, N., Kobayashi, T., Kataoka, M., Watanabe, H. F. J., Fukase, T., Muto, Y., & Takei, F. (1988). Interference between Superconductivity and Martensitic Transition in A15 Compounds. journal of the physical society of japan, 57(9), 3089-3101. https://doi.org/10.1143/JPSJ.57.3089

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abstract = "An interference effect between the high-Tc superconductivity and martensitic transition in A15 compounds such as V3Si and Nb3Sn has been studied. It is found from the measurements of the sound velocity, sound attenuation, thermal dilation and the electrical resistance, that an occurrence of superconductivity interferes drastically with the developing tetragonal distortions caused by the martensitic transformation, but the high-Tc superconductivity in these compounds is only weakly affected by the presence of the martensitic transition. This unilateral interference effect is qualitatively consistent with the second-order band Jahn-Teller mechanism which means the Fermi level crossing the upper split band of the doubly degenerate Γ12 subbands. Discussions on Tc are given on the basis of the Fermi surface effect of Γ12 subbands.",

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AU - Toyota, Naoki

AU - Kobayashi, Tsukasa

AU - Kataoka, Mitsuo

AU - Watanabe, Hirohide F.J.

AU - Fukase, Tetsuo

AU - Muto, Yoshio

AU - Takei, Fumihiko

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AB - An interference effect between the high-Tc superconductivity and martensitic transition in A15 compounds such as V3Si and Nb3Sn has been studied. It is found from the measurements of the sound velocity, sound attenuation, thermal dilation and the electrical resistance, that an occurrence of superconductivity interferes drastically with the developing tetragonal distortions caused by the martensitic transformation, but the high-Tc superconductivity in these compounds is only weakly affected by the presence of the martensitic transition. This unilateral interference effect is qualitatively consistent with the second-order band Jahn-Teller mechanism which means the Fermi level crossing the upper split band of the doubly degenerate Γ12 subbands. Discussions on Tc are given on the basis of the Fermi surface effect of Γ12 subbands.

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KW - martensitic transition

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