Pressure induced superconductivity on the border of magnetic order in MnP

Abstract

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 Tsc~1 K emerges and exists merely near the critical pressure Pc~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 quasi-particle effective mass near Pc associated with the magnetic quantum fluctuations.

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