Pressure Effect on Superconductivity and Magnetism in α-FeSex

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In this paper, the pressure effect on superconductivity and magnetism has been investigated in FeSex (x=0.80,0.88). The magnetization curves display anomaly at Ts1∼106 K and Ts2∼78 K except for the superconducting diamagnetic transition around Tc∼8 K. The magnetic anomaly at Ts1 and Ts2 can be related to a ferromagnetic and an antiferromagnetic phase transition, respectively, as revealed by specific heat measurements. The application of pressure not only raises Tc, but also increases both Ts1 and Ts2.

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