不弾性ニュートロン散乱による非従来の超伝導性Ba{0.6}K{0.4}Fe2As2

A D Christianson¹, E A Goremychkin, R Osborn

¹Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

Nature

|December 19, 2008

まとめ

鉄アルセニド超伝導体は,銅酸化物と同様の非常識な対称性を示す. 不弾性ニュートロン散乱は磁気共鳴を明らかにし,鉄基材料におけるこのユニークな超伝導エネルギーギャップを確認した.

科学分野:

凝縮物質物理学凝縮物質物理学
材料科学材料科学とは
量子材料は,量子的な物質である.

背景:

鉄アルセニド超伝導体は,高過渡温度 (T) >50Kを示し,銅酸化物超伝導体と並行しています.
両方の材料クラスにおける超伝導性は,化学的ドーピングによる反鉄磁的秩序の抑制により発生する.
銅酸化物超伝導体には特徴的な磁気共鳴が存在し,非伝統的な超伝導体エネルギーギャップ対称性に関連しています.

研究の目的:

鉄アルセニド超伝導体における超伝導エネルギーギャップの対称性を調査するために.
鉄アルセニドが,銅酸化物で観察される非常規のギャップ対称性を共有しているかどうかを判断する.
鉄アルセニドにおける超伝導性の性質に関する相感度証拠を提供するため.

主な方法:

不弾性ニュートロン散乱実験は,Ba{0.6}K{0.4}Fe{2}As{2}で実施されました.
測定は,超伝導的移行温度 (T ((c)) 未満で行われました.
この研究は,超伝導相内の磁気刺激の観測に焦点を当てた.

主要な成果:

磁気共鳴は,T (c) 未満で,Ba (0.6) K (0.4) Fe (2) As (2) で観察されました.
この共鳴は,非常識な超伝導的エネルギーギャップ対称性を示している.
この発見は,このギャップ対称性に対する相感性の証拠を提供します.

結論:

鉄アルセニド超伝導体は,非伝統的な超伝導エネルギーギャップ対称性を持っています.
この対称性は,酸化銅の超伝導体に見られるものと類似しています.
観測された磁気共鳴は,鉄アルセニドのユニークな電子配列相互作用を確認しています.

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