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首页> 外文期刊>Physical review >Superconductivity and phase diagram of (Li_(0.8)Fe_(0.2))OHFeSe_(1-x)S_x
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Superconductivity and phase diagram of (Li_(0.8)Fe_(0.2))OHFeSe_(1-x)S_x

机译:(Li_(0.8)Fe_(0.2))OHFeSe_(1-x)S_x的超导和相图

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摘要

A series of (Li_(0.8)Fe_(0.2))OHFeSe_(1-x)S_x (0 ≤ x ≤ 1) samples were successfully synthesized via hydrothermal reaction method and the phase diagram is established. Magnetic susceptibility suggests that an antiferromagnetism arising from (Li_(0.8)Fe_(0.2))OH layers coexists with superconductivity, and the antiferromagnetic transition temperature nearly remains constant for various S doping levels. In addition, the lattice parameters of the both a and c axes decrease and the superconducting transition temperature T_c is gradually suppressed with the substitution of S for Se, and eventually superconductivity vanishes at x = 0.90. The decrease of T_c could be attributed to the effect of chemical pressure induced by the smaller ionic size of S relative to that of Se, being consistent with the effect of hydrostatic pressure on (Li_(0.8)Fe_(0.2))OHFeSe. But the detailed investigation on the relationships between T_c and the crystallographic facts suggests a very different dependence of T_c on anion height from the Fe2 layer or Ch-Fe2-Ch angle from those in FeAs-based superconductors.
机译:通过水热反应法成功合成了一系列(Li_(0.8)Fe_(0.2))OHFeSe_(1-x)S_x(0≤x≤1)样品,并建立了相图。磁化率表明,由(Li_(0.8)Fe_(0.2))OH层引起的反铁磁性与超导电性共存,并且对于各种S掺杂水平,反铁磁性转变温度几乎保持恒定。另外,a和c轴的晶格参数都减小,并且用S代替Se逐渐抑制了超导转变温度T_c,最终在x = 0.90时,超导性消失了。 T_c的降低可能归因于S的相对于Se较小的离子尺寸引起的化学压力效应,这与静液压对(Li_(0.8)Fe_(0.2))OHFeSe的影响一致。但是,对T_c与晶体学事实之间关系的详细研究表明,T_c对基于Fe2层或Ch-Fe2-Ch角的阴离子高度的依赖性与基于FeAs的超导体的依赖性非常不同。

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  • 来源
    《Physical review》 |2014年第21期|214520.1-214520.6|共6页
  • 作者单位

    Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, People's Republic of China,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China;

    CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China,Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China;

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, People's Republic of China;

    CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China,Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China;

    Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China,Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, People's Republic of China,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    superconductivity phase diagrams; properties of type Ⅰand type Ⅱsuperconductors;

    机译:超导相图;Ⅰ型和Ⅱ型超导体的特性;

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