Keywords: 
• 超导 /
• 压力 /
• Cr基化合物 /
• 量子临界

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 super-conductivity emerges in the vicinity of a long-range antiferromagnetically ordered state. In addi-tion to doping charge carriers,the application of external pressure is an effective and clean ap-proach 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 uncon-ventional 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.