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首页> 外文期刊>Physical review >Effect of interlayer coupling on the coexistence of antiferromagnetism and superconductivity in Fe pnictide superconductors: A study of Ca_(0.74(1))La_(0.26(1))(Fe_(1-x)Co_x)As_2 single crystals
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Effect of interlayer coupling on the coexistence of antiferromagnetism and superconductivity in Fe pnictide superconductors: A study of Ca_(0.74(1))La_(0.26(1))(Fe_(1-x)Co_x)As_2 single crystals

机译:层间耦合对铁氧体超导体中反铁磁性和超导性共存的影响:Ca_(0.74(1))La_(0.26(1))(Fe_(1-x)Co_x)As_2单晶的研究

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摘要

We report the transport, thermodynamic, muon spin relaxation, and neutron study of the Ca_(0.74(1))La_(0.26(1))(Fe_(1-x)Co_x)As_2 single crystals, mapping out the temperature-doping level phase diagram. Upon Co substitution on the Fe site, the structural and magnetic phase transitions in this 112 compound are suppressed and superconductivity up to 20 K occurs. Our measurements of the superconducting and magnetic volume fractions show that these two phases coexist microscopically in the underdoped region, in contrast to the related Ca_(10)(Pt_3As_8)((Fe_(1-x)Pt_x)_2As_2)_5 (10-3-8) compound, where coexistence is absent. Supported by model calculations, we discuss the differences in the phase diagrams of the 112 and 10-3-8 compounds in terms of the FeAs interlayer coupling, whose strength is affected by the character of the spacer layer, which is metallic in the 112 compound and insulating in the 10-3-8 compound.
机译:我们报告了Ca_(0.74(1))La_(0.26(1))(Fe_(1-x)Co_x)As_2单晶的输运,热力学,μ自旋弛豫和中子研究,并绘制了温度掺杂水平相图。在Fe位置上被Co取代后,该112化合物中的结构和磁性相变得到抑制,并且发生了高达20 K的超导性。我们对超导和磁体积分数的测量表明,与相关的Ca_(10)(Pt_3As_8)((Fe_(1-x)Pt_x)_2As_2)_5(10-3)相比,这两个相在微观上共存于欠掺杂区-8)不存在共存的化合物。在模型计算的支持下,我们讨论了112和10-3-8化合物在FeAs层间耦合方面的相图差异,FeAs层间耦合的强度受间隔层特性的影响,该间隔层在112化合物中为金属并在10-3-8化合物中绝缘。

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  • 来源
    《Physical review》 |2016年第17期|174513.1-174513.5|共5页
  • 作者单位

    Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

    Department of Physics, Columbia University, New York, New York 10027, USA;

    School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA;

    Department of Physics, McMaster University, Hamilton, Ontario, Canada, L8S 4M1,Canadian Institute for Advanced Research, 180 Dundas St. W., Toronto, Ontario, Canada, M5G 1Z7;

    Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

    Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

    Department of Physics, McMaster University, Hamilton, Ontario, Canada, L8S 4M1,Canadian Institute for Advanced Research, 180 Dundas St. W., Toronto, Ontario, Canada, M5G 1Z7;

    Department of Physics, Columbia University, New York, New York 10027, USA;

    School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA;

    Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA;

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