Growth and Superconductivity of FeSex Crystals
U. Patel, J. Hua, S. H. Yu, S. Avci, Z. L. Xiao, H. Claus, J., Schlueter, V. V. Vlasko-Vlasov, U. Welp, and W. K. Kwok
TL;DR
This paper reports the growth of FeSex crystals via vapor self-transport, demonstrating their superconducting properties with a critical temperature up to 11.8 K and revealing coexistence of superconductivity and ferromagnetism.
Contribution
It introduces a vapor self-transport method for growing FeSex crystals and characterizes their superconducting and magnetic properties.
Findings
Crystals reach zero-resistance at 7.5 K
Superconducting transition up to 11.8 K observed
Coexistence of superconductivity and ferromagnetism confirmed
Abstract
Iron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The crystals consist of the dominant alpha - phase with trace amounts of beta- 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 co-existence of superconductivity and ferromagnetism.
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