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CrAs——第一个Cr 基化合物超导体的发现

吴伟, 程金光, 雒建林

吴伟, 程金光, 雒建林. CrAs——第一个Cr 基化合物超导体的发现[J]. 物理, 2016, 45(2): 73-79. DOI: 10.7693/wl20160201
引用本文: 吴伟, 程金光, 雒建林. CrAs——第一个Cr 基化合物超导体的发现[J]. 物理, 2016, 45(2): 73-79. DOI: 10.7693/wl20160201
WU Wei, CHENG Jin-Guang, LUO Jian-Lin. The discovery of superconductivity in Cr-based compounds[J]. PHYSICS, 2016, 45(2): 73-79. DOI: 10.7693/wl20160201
Citation: WU Wei, CHENG Jin-Guang, LUO Jian-Lin. The discovery of superconductivity in Cr-based compounds[J]. PHYSICS, 2016, 45(2): 73-79. DOI: 10.7693/wl20160201

CrAs——第一个Cr 基化合物超导体的发现

The discovery of superconductivity in Cr-based compounds

  • 摘要: 非常规超导体自发现以来便引起了凝聚态物理学家的广泛兴趣,诸如重费米子超导体,铜基高温超导体和铁基高温超导体等。这类超导体的一个基本特征是,当长程反铁磁序被抑制时会出现超导现象。而要破坏长程磁有序,除了掺杂不同元素以引入电荷载流子或者化学压力外,物理加压也是一种有效的调控手段。文章将介绍第一个Cr基化合物超导体——CrAs单晶通过物理加压首次实现超导电性的过程。当压力为8 kbar 时,超导临界温度出现在2 K,这时发生在常压下265 K的一级反铁磁相变被完全压制。在CrAs体系中,超导与反铁磁序之间的竞争关系说明CrAs是非常规超导体。CrAs的超导也为发现新型超导体打开了一扇大门。
    Abstract: One of the most common features of unconventional superconducting systems such as heavy fermions,high transition-temperature cuprates and iron pnictides is that the superconductivity emerges in the vicinity of a long-range antiferromagnetically ordered state. In addition to doping charge carriers,the application of external pressure is an effective and clean approach to induce unconventional superconductivity near a magnetic quantum critical point. Here we report on the discovery of superconductivity on the verge of antiferromagnetic order in CrAs via the application of external pressure. Bulk superconductivity with Tc=2 K emerges at the critical pressure Pc=8 kbar,where the first-order antiferromagnetic transition at TN=265 K under ambient pressure is completely suppressed.The close proximity of superconductivity to an antiferromagnetic order suggests an unconventional pairing mechanism for CrAs. The present finding opens a new avenue in the search for novel superconductors in Cr and other transition metal based systems.
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出版历程
  • 收稿日期:  2015-06-02
  • 发布日期:  2016-02-11

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