| High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in （T1,Rb）：Fe4Se5 Superconductor |
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| 引用本文： | 叶峰,;鲍威,;池松雪,;Antonio M. dos Santos,;Jamie J. Molaison,;方明虎,;王杭栋,;毛乾辉,;汪晋辰,;刘娟娟,;盛洁明.High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in （T1,Rb）：Fe4Se5 Superconductor[J].中国物理快报,2014(12):111-114. |
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| 作者姓名： | 叶峰 ;鲍威 ;池松雪 ;Antonio M. dos Santos ;Jamie J. Molaison ;方明虎 ;王杭栋 ;毛乾辉 ;汪晋辰 ;刘娟娟 ;盛洁明 |
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| 作者单位： | [1]Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge 37831, USA; [2]Department of Physics and Astronomy, University of Kentucky, Lexington 40506, USA; [3]Department of Physics, Renmin University of China, Beijing 100872; [4]Department of Physics, Zhejiang University, Hangzhou 310027 |
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| 基金项目： | Supported by the National Basic Research Program of China under Grant Nos 2012CB921700, 2011CBA00112, 2011CBA00103 and 2012CB821404, the National Natural Science Foundation of China under Grant Nos 11034012, 11190024, 11374261 and 11204059, the Natural Science Foundation of Zhejiang Province under Grant No LQI2A04007, and the Scientific User Facilities Division of the Office of Basic Energy Sciences of U.S. DOE. |
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| 摘 要： | The recently discovered metal-intercalated iron selenide superconductors A2Fe4Se5 （A=K, Cs, T1- K, Rb, T1-Rb） （245） compounds, with Tc ～30K, have attracted much interest A high transition- temperature （TN ≈ 470-560K） and large magnetic moment （3.3μB/Fe） block antiferromagnetic （AFM） order exists in the superconducting samples. Mag- netic order-parameter experiences an anomaly when Tc is approached. The superconductors crystal- lize with a highly ordered √5 × √5 superstructure, in which the Fel site of the I4/m structure is only a few percents occupied and the Fe2 site is fully occupied. The non-superconducting samples at low-T also crystallize in the I4/m structure, while both Fe sites are fractionally occupied, since the numbers of the Fe vacancies in the samples and the vacant sites in the √5 × √5 pattern are mismatched. The partially ordered √5× √5 vacancy order becomes one of three competing phases for temperature below room temperature up to ～ 500K, namely, these sam- ples are phase-separated and in the miscibility gap 1lacier the n,mhi~nt condition.
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| 关 键 词： | 超导体 反铁磁 中子散射 单晶 高压 磁性 RB 溶解度间隙 |
High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in （T1,Rb）：Fe4Se5 Superconductor |
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| Institution: | YE Feng, BAO Wei, CHI Song-Xue, Antonio M. dos Santos, Jamie J. Molaison, FANG Ming-Hu, WANG Hang-Dong, MAO Qian-Hui, WANG Jin-Chen, LIU Juan-Juan, SHENG Jie-Ming( 1 Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge 37831, USA 2Department of Physics and Astronomy, University of Kentucky, Lexington 40506, USA 3Department of Physics, Renmin University of China, Beijing 100872 4Department of Physics, Zhejiang University, Hangzhou 310027) |
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