Superconductivity of 2.2 K under Pressure in Helimagnet CrAs
Abstract
We report resistivity measurements of the helimagnet CrAs under pressures. The helimagnetic transition with TN ~ 265 K at ambient pressure is completely suppressed above a critical pressure of Pc ~ 0.7 GPa, and superconductivity is observed at ~2.2 K for zero resistance, which exists in a wide pressure range extending beyond 3 GPa. Both the upper critical field Hc2 and the coefficient A in the resistivity increase toward Pc, suggesting that the superconductivity of CrAs is mediated by electronic correlations enhanced in the vicinity of the helimagnetic phase.
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