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Superconductivity in doped Sr_2IrO_4: A functional renormalization group study

机译:掺杂Sr_2IrO_4中的超导电性:功能重整化研究

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摘要

Using the functional renormalization group we investigated possible superconductivity in doped Sr_2IrO_4. In the electron-doped case, a d_(x~2-y~2)~*-wave superconducting phase is found in a narrow doping region. The pairing is driven by spin fluctuations within the single conduction band. In contrast, for hole doping an s_±~*-wave phase is established, triggered by spin fluctuations within and across the two conduction bands. In all cases there are comparable singlet and triplet components in the pairing function. The Hund's rule coupling reduces (enhances) superconductivity for electron (hole) doping. Our results imply that hole doping is more promising to achieve a higher transition temperature. Experimental perspectives are discussed.
机译:使用功能重整化组,我们研究了掺杂的Sr_2IrO_4中可能的超导性。在电子掺杂的情况下,在狭窄的掺杂区域中发现了d_(x〜2-y〜2)〜*波超导相。配对由单个导带内的自旋波动驱动。相反,对于空穴掺杂,由于两个导带内和跨两个导带的自旋波动而触发,建立了s_±*波相位。在所有情况下,配对功能中都有可比较的单线态和三线态成分。洪德法则耦合减小(增强)了电子(空穴)掺杂的超导性。我们的结果表明,空穴掺杂更有望实现更高的转变温度。实验角度进行了讨论。

著录项

  • 来源
    《Physical review》 |2014年第9期|094518.1-094518.5|共5页
  • 作者单位

    National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China;

    Zhejiang Institute of Modern Physics & Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Hangzhou Normal University, Hangzhou 310036, China;

    National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    strongly correlated electron systems; heavy fermions; pairing symmetries (other than s-wave);

    机译:强相关电子系统;重费米子配对对称(s波除外);

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