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Pseudogap formation above the superconducting dome in iron pnictides

机译:铁肽中超导穹顶上方的伪多普达形成

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摘要

The nature of the pseudogap (PG) in high transition temperature (high T_c) superconducting cuprates has been a major issue in condensed matter physics. It is still unclear whether the high T_c superconductivity can be universally associated with the PG formation. Here we provide direct evidence of the existence of the PG phase via angle-resolved photoemission spectroscopy in another family of high T_c superconductor, iron pnictides. Our results reveal a composition-dependent PG formation in the multiband electronic structure of BaFe _2(As_(1-x)P_x)_2. The PG develops well above the magnetostructural transition for low x, persists above the nonmagnetic superconducting dome for optimal x, and is destroyed for x ~ 0.6, thus showing a notable similarity with cuprates. In addition, the PG formation is accompanied by inequivalent energy shifts in the zx/yz orbitals of iron atoms, indicative of a peculiar iron orbital ordering which breaks the fourfold rotational symmetry.
机译:高转变温度(高T_c)超导铜酸盐中的伪间隙(PG)的性质一直是凝聚态物理中的一个主要问题。尚不清楚高T_c超导性是否可以与PG形成普遍相关。在这里,我们通过角度分辨光发射光谱法在另一个高T_c超导体铁族铁的家族中提供了PG相的直接证据。我们的结果揭示了BaFe _2(As_(1-x)P_x)_2的多波段电子结构中依赖成分的PG形成。 PG在低x时在磁结构转变之上发展,在最佳x时在非磁性超导穹顶之上持续发展,并在x〜0.6时被破坏,因此与铜酸盐表现出显着相似性。此外,PG的形成伴随着铁原子的zx / yz轨道中能量的不等价移动,这表明特殊的铁轨道有序性破坏了四重旋转对称性。

著录项

  • 来源
    《Physical review》 |2014年第4期|045101.1-045101.10|共10页
  • 作者单位

    Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan,JST, CREST, Chiyoda, Tokyo 102-0075, Japan;

    Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan;

    ISSP, University of Tokyo, Kashiwa 277-8581 Japan,JST, TRIP, Chiyoda, Tokyo 102-0075, Japan;

    Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan;

    RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan,Department of Physics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan;

    JST, CREST, Chiyoda, Tokyo 102-0075, Japan,ISSP, University of Tokyo, Kashiwa 277-8581 Japan,JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan;

    Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan;

    KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan;

    KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan;

    Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan;

    Hiroshima Synchrotron Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan;

    Hiroshima Synchrotron Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan;

    Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan;

    Hiroshima Synchrotron Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan;

    Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan,Hiroshima Synchrotron Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    JST, TRIP, Chiyoda, Tokyo 102-0075, Japan,National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;

    ISSP, University of Tokyo, Kashiwa 277-8581 Japan,JST, TRIP, Chiyoda, Tokyo 102-0075, Japan;

    Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan,Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan,JST, CREST, Chiyoda, Tokyo 102-0075, Japan,JST, PRESTO, Kawaguchi, Saitama 332-0012, Japan;

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

    photoemission and photoelectron spectra; superconductivity phase diagrams;

    机译:光发射和光电子光谱;超导相图;

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