Pressure effect on superconductivity and magnetism in FeSex

Details Pressure effect on superconductivity and magnetism in FeSex Pressure effect on superconductivity and magnetism in FeSex

2008-08-31

arxiv.org/abs/0809.0128v1

Physics

Condensed Matter

Superconductivity

Scientific paper

In this paper, 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. This system shows clear evidence that superconductivity arises in a phase with strong magnetic character and the superconductivity coexists with magnetism. In addition, the specific heat anomaly associated with the superconducting transition seems to be absent.

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