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FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$系の酸素欠損

Oxygen deficiency in FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ magnetic superconductor

茂筑 高士*; 畑 慶明*; 土屋 佳則*; 井川 直樹   ; 星川 晃範*; 石垣 徹*; 安岡 宏*; 小澤 清*; 平田 和人*

Mochiku, Takashi*; Hata, Yoshiaki*; Tsuchiya, Yoshinori*; Igawa, Naoki; Hoshikawa, Akinori*; Ishigaki, Toru*; Yasuoka, Hiroshi*; Ozawa, Kiyoshi*; Hirata, Kazuto*

FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$系の超伝導体は、CuとFeの秩序配列化及び酸素欠損が超伝導発現に重要な役割を果たしている。中性子回折法によって、非超伝導相では、酸素量6+$$delta$$が7付近でのみ安定であり、また、超伝導相の出現は酸素量6+$$delta$$が7.6付近に集中することを明らかにした。

It is well known that the superconductive phase is related with the ordering of Cu and Fe, and with the oxygen deficiency in FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$. We investigated the oxygen deficiency of FeSr$$_{2}$$YCu$$_{2}$$O$$_{6+delta}$$ by neutron diffraction method. It was shown that non superconductor phase was stable around the oxygen content 6+$$delta$$ = 7 and that the superconductive phase was appeared at 7.6 of the oxygen content 6+$$delta$$.

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