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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

The discovery of superconductivity in Cr-based compounds

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  • Received Date: June 02, 2015
  • Published Date: February 11, 2016
  • 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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