Growth and superconductivity of FeSex crystals

Patel, U.; Hua, J.; Yu, S. H.; Avci, S.; Xiao, Z. L.; Claus, H.; Schlueter, J.; Vlasko-Vlasov, V. V.; Welp, U.; Kwok, W. K.
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p082508
Academic Journal
Iron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The crystals consist of the dominant α-phase with trace amounts of β-phase as identified by powder x-ray diffraction. With four-probe resistance measurements, we obtained a zero resistance critical temperature of 7.5 K and a superconducting onset transition temperature of up to 11.8 K in zero magnetic field as well as an anisotropy of 1.5±0.1 for the critical field. Magnetization measurements on individual crystals reveal the coexistence of superconductivity and ferromagnetism.


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