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首页> 外文期刊>Physical review >Superconductivity and magnetism in Rb_(0.8)Fe_(1.6)Se_2 under pressure
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Superconductivity and magnetism in Rb_(0.8)Fe_(1.6)Se_2 under pressure

机译:Rb_(0.8)Fe_(1.6)Se_2在压力下的超导和磁性

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摘要

High-pressure magnetization, structural, and ~(57)Fe Mossbauer studies were performed on superconducting Rb_(0.8)Fe_(1.6)Se_(2.0) with T_c = 32.4 K. The gradual decrease of T_c with increasing pressure up to 5 GPa is followed by a step-like suppression of superconductivity at higher pressures. No structural phase transition in the Fe vacancy-ordered superstructure is observed in synchrotron x-ray diffraction (XRD) studies up to 15.6 GPa. The Mossbauer spectra above 5 GPa reveal the appearance of a new paramagnetic phase, exhibiting magnetic order below 80 K, coinciding with the irreversible disappearance of superconductivity. We interpret these changes as due to a pressure-induced diffusion of Rb ions between the two phases, responsible for the antiferromagnetism and superconductivity in Rb_(0.8)Fe_(1.6)Se_(2.0).
机译:对Tb = 32.4 K的超导Rb_(0.8)Fe_(1.6)Se_(2.0)进行了高压磁化,结构和〜(57)Fe Mossbauer研究。随着压力增加到5 GPa,T_c逐渐减小然后在较高压力下逐步抑制超导。在高达15.6 GPa的同步加速器X射线衍射(XRD)研究中未观察到Fe空位有序的上部结构中的结构相变。高于5 GPa的Mossbauer光谱揭示了一个新的顺磁性相的出现,在80 K以下表现出磁阶,这与超导性的不可逆消失相吻合。我们将这些变化解释为是由于Rb离子在两相之间的压力诱导扩散所致,这是Rb_(0.8)Fe_(1.6)Se_(2.0)中的反铁磁性和超导电性的原因。

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  • 来源
    《Physical review》 |2012年第21期|p.214519.1-214519.6|共6页
  • 作者单位

    Institut fuer Anorganische und Analytische Chemie, Johannes Gutenberg-Universitaet, D-55099 Mainz, Germany;

    Max-Planck Institute for Chemistry, D-55128 Mainz, Germany,Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;

    Graduate School of Excellence Material Science in Mainz, D-55099 Mainz, Germany;

    Department Physik, Universitaet Paderborn, D-33095 Paderborn, Germany;

    Max-Planck Institute for Chemistry, D-55128 Mainz, Germany,Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland;

    Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany,Institute of Applied Physics, Academy of Sciences, MD-2028, Chisinau, Republic of Moldova;

    Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany;

    Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany;

    Institut fuer Anorganische und Analytische Chemie, Johannes Gutenberg-Universitaet, D-55099 Mainz, Germany,Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;

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  • 正文语种 eng
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  • 关键词

    pressure effects; intrinsic properties of magnetically ordered materials;

    机译:压力影响;磁性有序材料的固有特性;

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