Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
Phys Rev Lett. 2015 Mar 20;114(11):117001. doi: 10.1103/PhysRevLett.114.117001. Epub 2015 Mar 16.
We report the discovery of superconductivity on the border of long-range magnetic order in the itinerant-electron helimagnet MnP via the application of high pressure. Superconductivity with T(sc)≈1 K emerges and exists merely near the critical pressure P(c)≈8 GPa, where the long-range magnetic order just vanishes. The present finding makes MnP the first Mn-based superconductor. The close proximity of superconductivity to a magnetic instability suggests an unconventional pairing mechanism. Moreover, the detailed analysis of the normal-state transport properties evidenced non-Fermi-liquid behavior and the dramatic enhancement of the quasiparticle effective mass near P(c) associated with the magnetic quantum fluctuations.
我们报告了在巡游电子螺旋磁体 MnP 中远程序磁有序的边界处通过施加高压发现超导。在约 8 GPa 的临界压力 P(c)附近出现了超导性，超导转变温度 T(sc)≈1 K，仅在该处长程序磁有序刚好消失。目前的发现使 MnP 成为第一个 Mn 基超导体。超导与磁不稳定性的紧密接近表明存在非常规配对机制。此外，对正常态输运性质的详细分析表明存在非费米液体行为，以及与磁量子涨落相关的在 P(c)附近准粒子有效质量的急剧增强。
