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Magnon-induced superconductivity in field-cooled spin-1/2 antiferromagnets

机译：场冷自旋1/2反铁磁体中的磁振子超导性

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摘要

If, during the preparation, an external magnetic field is applied upon cooling we say it has been field cooled. A novel mechanism for insulator-metal transition and superconductivity in field-cooled spin-1/2 antiferromagnets on bcc lattice is discussed. Applying a magnetic field along the sublattice B magnetization, we change the magnetic and transport properties of the material. There is a critical value H_(cr1-). When the magnetic field is below the critical one H < H_(cr1) the prepared material is a spin-1/2 antiferromagnetic insulator. When H > H_(cr1) the sublattice A electrons are delocalized and the material is metal. There is a second critical value H_(cr2) > H_(cr1). When H = H_(cr2), it is shown that the Zeeman splitting of the sublattice A electrons is zero and they do not contribute to the magnetization of the system. At this quantum partial order point (QPOP) the sublattice B transversal spin fluctuations (magnons) interact with sublattice A electrons inducing spin antiparallel p-wave superconductivity which coexists with magnetism. At zero temperature the magnetic moment of sublattice B electrons is maximal. Below the Neel temperature (T_N) the gap is approximately constant with a small increase when the system approaches T_N. It abruptly falls down to zero at temperatures above T_N.
机译：如果在准备过程中在冷却时施加了外部磁场，我们说它已被场冷却。讨论了bcc晶格上场冷自旋1/2反铁磁体中绝缘体-金属过渡和超导性的新机制。沿着亚晶格B的磁化强度施加磁场，我们可以改变材料的磁和输运性质。存在临界值H_（cr1-）。当磁场低于临界值H H_（cr1）时，亚晶格A电子离域，材料为金属。存在第二临界值H_（cr2）> H_（cr1）。当H = H_（cr2）时，表明子晶格A电子的塞曼分裂为零，它们对系统的磁化没有贡献。在该量子偏序点（QPOP），子晶格B的横向自旋涨落（磁振子）与子晶格A的电子相互作用，从而感应出与磁共存的自旋反平行p波超导。在零温度下，亚晶格B电子的磁矩最大。低于Neel温度（T_N）时，当系统接近T_N时，间隙近似恒定，并且增加很小。在高于T_N的温度下，它突然降至零。

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  • 来源
    《Physical review》 |2017年第21期|214409.1-214409.9|共9页
  • 作者

    Naoum Karchev;

  • 作者单位

    Department of Physics, University of Sofia, 1164 Sofia, Bulgaria;

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