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Magnetic and Ising quantum phase transitions in a model for isoelectronically tuned iron pnictides

机译：等电调谐铁肽模型中的磁性和Ising量子相变

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摘要

Considerations of the observed bad-metal behavior in Fe-based superconductors led to an early proposal for quantum criticality induced by isoelectronic P for As doping in iron arsenides, which has since been experimentally confirmed. We study here an effective model for the isoelectronically tuned pnictides using a large-N approach. The model contains antiferromagnetic and Ising-nematic order parameters appropriate for J_1-J_2 exchange-coupled local moments on an Fe square lattice, and a damping caused by coupling to itinerant electrons. The zero-temperature magnetic and Ising transitions are concurrent and essentially continuous. The order-parameter jumps are very small, and are further reduced by the interplane coupling; consequently, quantum criticality occurs over a wide dynamical range. Our results reconcile recent seemingly contradictory experimental observations concerning the quantum phase transition in the P-doped iron arsenides.
机译：考虑到在铁基超导体中观察到的有害金属行为的考虑，导致了关于由等电子P诱导砷化铁中砷掺杂的量子临界性的早期提议，此后已通过实验得到证实。我们在这里研究使用大N方法对等电子调谐的肽进行分析的有效模型。该模型包含适用于Fe方格上J_1-J_2交换耦合局部矩的反铁磁和Ising向列级参数，以及与流动电子耦合引起的阻尼。零温磁跃迁和伊辛跃迁是同时发生的，并且基本上是连续的。阶跃参数非常小，并且通过平面间耦合进一步减小；因此，量子临界发生在很宽的动力学范围内。我们的结果与最近看似矛盾的关于P掺杂铁砷化物中量子相变的实验观察结果一致。

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  • 来源
    《Physical review》 |2016年第10期|104515.1-104515.5|共5页
  • 作者

    Jianda Wu; Qimiao Si; Elihu Abrahams;

  • 作者单位

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA ,Department of Physics, University of California, San Diego, California 92093, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

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

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