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Low temperature structure of FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ magnetic superconductor

磁性超伝導体FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$の低温構造

茂筑 高士*; 畑 慶明*; Wuernisha, T.*; 井川 直樹; 星川 晃範*; 石垣 徹*; 安岡 宏*; 平田 和人*

Mochiku, Takashi*; Hata, Yoshiaki*; Wuernisha, T.*; Igawa, Naoki; Hoshikawa, Akinori*; Ishigaki, Toru*; Yasuoka, Hiroshi*; Hirata, Kazuto*

FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+}$$$$_{delta}$$系超伝導体における結晶構造と超伝導物性との相関を明らかにするため、超伝導体FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+}$$$$_{delta}$$とCuサイトの一部をZnで置換することで超伝導を発現しない試料FeSr$$_{2}$$Y(Cu$$_{0.95}$$Zn$$_{0.05}$$)$$_{2}$$O$$_{6+}$$$$_{delta}$$について中性子回折実験を行った。その結果、本超伝導体中では磁気超格子に起因する反射は観察されず、磁気秩序は長距離秩序を持たないことが明らかになった。この超伝導体では30K付近で非超伝導体では観測されないCuに関連する特異点が見られたことから、この温度で電荷分布変化が生じている可能性がある。

We have performed neutron powder diffraction of the superconducting FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+}$$$$_{delta}$$ and the nonsuperconducting FeSr$$_{2}$$Y(Cu$$_{0.95}$$Zn$$_{0.05}$$)$$_{2}$$O$$_{6+}$$$$_{delta}$$ samples at low temperature and room temperature to investigate the relation between the crystal structure ant the physical properties. Neutron diffraction study indicates that the magnetic order in this compound is not long-range order because we observed no extra reflection due to the magnetic superstructure. We have observed structural anomaly related to Cu in the superconducting sample around 30 K although we could not observe it in the nonsuperconducting sample. There is possibility of the change of the charge distribution around 30 K in the superconducting sample.

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パーセンタイル:86.16

分野:Physics, Applied

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