Superconductivity in the vicinity of antiferromagnetic order in CrAs
Superconductivity in the vicinity of antiferromagnetic order in CrAs
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CrAs 反铁磁序附近的超导性
DOI：
10.1038/ncomms6508
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发表时间：
2014-11-01
影响因子：
16.6
通讯作者：
Luo, Jianlin
中科院分区：
文献类型：
--
作者：
Wu, Wei;Cheng, Jinguang;Luo, Jianlin
重费米子超导体、高转变温度铜氧化物超导体和铁磷属元素化物超导体等非常规超导体系的一个共同特征是在长程反铁磁有序态附近出现超导性。除了掺杂载流子之外，施加外部压力是在磁量子临界点附近诱导非常规超导性的有效和干净的方法。在这里，我们报告发现的超导性的边缘反铁磁秩序的铬通过施加外部压力。在临界压力Pc = 8kbar时出现了Tc = 2K的体超导，在此压力下，室温下TN = 265K时的一级反铁磁转变被完全抑制。超导电性的反铁磁秩序的紧密接近表明一个非常规的配对机制铬砷。这一发现为在铬和其他过渡金属体系中寻找新型超导体开辟了新的途径。
One of the common features of unconventional superconducting systems such as the heavy-fermion, high transition-temperature cuprate and iron-pnictide superconductors is that the superconductivity emerges in the vicinity of 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 withTc≈2 K emerges at the critical pressurePc≈8 kbar, where the first-order antiferromagnetic transition atTN≈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 for searching novel superconductors in the Cr and other transition metal-based systems.