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首页> 外文期刊>Physical review >Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe_(1-x)Co_x)_2As_2
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Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe_(1-x)Co_x)_2As_2

机译:Ca(Fe_(1-x)Co_x)_2As_2退火态中磁性,非磁性和超导状态的控制

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摘要

We have grown single-crystal samples of Co substituted CaFe_2As_2 using an FeAs flux and systematically studied the effects of annealing/quenching temperature on the physical properties of these samples. Whereas the as-grown samples (quenched from 960 ℃) all enter the collapsed tetragonal phase upon cooling, annealing/quenching temperatures between 350 and 800 ℃ can be used to tune the system to low-temperature antiferromagnetic/orthorhomic or superconducting states as well. The progression of the transition temperature versus annealing/quenching temperature (T-T_(anneal)) phase diagrams with increasing Co concentration shows that, by substituting Co, the antiferromagnetic/orthorhombic and the collapsed tetragonal phase lines are separated and bulk superconductivity is revealed. We established a 3D phase diagram with Co concentration and annealing/quenching temperature as two independent control parameters. At ambient pressure, for modest x and T_(anneal) values, the Ca(Fe_(1-x)Co_x)_2As_2 system offers ready access to the salient low-temperature states associated with Fe-based superconductors: antiferromagnetic/orthorhombic, superconducting, and nonmagnetic/collapsed tetragonal.
机译:我们已经使用FeAs助熔剂生长了Co取代的CaFe_2As_2的单晶样品,并系统地研究了退火/淬火温度对这些样品的物理性能的影响。刚生长的样品(从960℃淬火)在冷却后均进入塌陷的四方相,而退火/淬火温度在350到800℃之间也可用于将系统调整到低温反铁磁/正交或超导状态。随着Co浓度的增加,转变温度对退火/淬火温度(T-T_(退火))相图的变化表明,通过取代Co,反铁磁/斜方晶和塌陷的四方相线被分离,并揭示了体超导性。我们建立了一个以Co浓度和退火/淬火温度为两个独立控制参数的3D相图。在环境压力下,对于适度的x和T_(退火)值,Ca(Fe_(1-x)Co_x)_2As_2系统可以轻松访问与基于Fe的超导体相关的显着低温状态:反铁磁/斜方晶,超导,和非磁性/塌陷的四边形。

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  • 来源
    《Physical review》 |2012年第22期|p.224528.1-224528.16|共16页
  • 作者单位

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    crystallographic aspects of phase transformations; pressure effects; intrinsic properties of magnetically ordered materials;

    机译:相变的晶体学方面;压力影响;磁性有序材料的固有特性;

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