Relationship between structure and superconductivity in FeSei-Te

Kazumasa Horigane; Haruhiro Hiraka; Kenji Ohoyama

doi:10.1143/JPSJ.78.074718

Relationship between structure and superconductivity in FeSei-Te

Kazumasa Horigane, Haruhiro Hiraka, Kenji Ohoyama

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

86 Citations (Scopus)

Abstract

We determined the crystal structural parameters of FeSe _1-xTe _x(x = 0:5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T _c of Fe _1-xTe _x increased with the (S _e, T _e)-F _e-(S _e, T _e) bond angle a in the Te-doped samples. However, T _c of F _eS _e did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in F _eS _e showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in F _eS _e.

Original language	English
Article number	074718
Journal	journal of the physical society of japan
Volume	78
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.78.074718
Publication status	Published - Jul 2009
Externally published	Yes

Keywords

Crystal structure analysis
Iron-based superconductor
Neutron powder diffraction

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.78.074718

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title = "Relationship between structure and superconductivity in FeSei-Te",

abstract = "We determined the crystal structural parameters of FeSe 1-xTe x(x = 0:5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T c of Fe 1-xTe x increased with the (S e, T e)-F e-(S e, T e) bond angle a in the Te-doped samples. However, T c of F eS e did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in F eS e showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in F eS e.",

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T1 - Relationship between structure and superconductivity in FeSei-Te

AU - Horigane, Kazumasa

AU - Hiraka, Haruhiro

AU - Ohoyama, Kenji

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N2 - We determined the crystal structural parameters of FeSe 1-xTe x(x = 0:5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T c of Fe 1-xTe x increased with the (S e, T e)-F e-(S e, T e) bond angle a in the Te-doped samples. However, T c of F eS e did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in F eS e showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in F eS e.

AB - We determined the crystal structural parameters of FeSe 1-xTe x(x = 0:5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T c of Fe 1-xTe x increased with the (S e, T e)-F e-(S e, T e) bond angle a in the Te-doped samples. However, T c of F eS e did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in F eS e showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in F eS e.

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KW - Iron-based superconductor

KW - Neutron powder diffraction

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Relationship between structure and superconductivity in FeSei-Te

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Keywords

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