Growth and Superconductivity of FeSex Crystals

Details Growth and Superconductivity of FeSex Crystals Growth and Superconductivity of FeSex Crystals

2009-02-13

arxiv.org/abs/0902.2240v1

Physics

Condensed Matter

Superconductivity

To appear in Applied Physics Letters

Scientific paper

10.1063/1.3093838

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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