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Doping-enhanced antiferromagnetism in Ca_(1-x)La_xFeAs_2

机译:Ca_(1-x)La_xFeAs_2中掺杂增强的反铁磁性

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摘要

In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here, we show that antiferromagnetism in Ca_(1-x)La_xFeAs_2 is robust against and even enhanced by doping. Using ~(75)As-nuclear magnetic resonance and nuclear quadrupole resonance techniques, we find that an antiferromagnetic order occurs below the Neel temperature T_N = 62 K at a high doping concentration (x = 0.15) where superconductivity sets in at the transition temperature T_c = 35 K. In the superconducting state coexisting with antiferromagnetism, the nuclear-spin-lattice relaxation rate 1/T_1 becomes proportional to T, indicating gapless excitations. Unexpectedly, T_N is enhanced with increasing doping, rising up to T_N = 70 K at x = 0.24. The obtained phase diagram of this system enriches the physics of iron-based high-T_c superconductors.
机译:在铁素化物中,通过掺杂抑制反铁磁性后出现高温超导。在这里,我们表明Ca_(1-x)La_xFeAs_2中的反铁磁性对掺杂具有鲁棒性,甚至可以增强。使用〜(75)As核磁共振和核四极共振技术,我们发现在高掺杂浓度(x = 0.15)的Neel温度T_N = 62 K以下,反铁磁阶发生,其中超导电性在转变温度T_c处= 35K。在与反铁磁性共存的超导状态下,自旋晶格弛豫速率1 / T_1与T成正比,表明无隙激励。出乎意料的是,T_N随着掺杂的增加而增强,在x = 0.24时上升到T_N = 70K。获得的该系统的相图丰富了铁基高T_c超导体的物理性质。

著录项

  • 来源
    《Physical review》 |2015年第18期|180508.1-180508.5|共5页
  • 作者单位

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan;

    Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan,Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    superconductivity phase diagrams; effects of crystal defects, doping and substitution;

    机译:超导相图;晶体缺陷;掺杂和取代的影响;

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