Growth and superconductivity of FeSex crystals


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Patel U., Hua J., Yu S. H. , Avci S. , Xiao Z. L. , Claus H., ...More

APPLIED PHYSICS LETTERS, vol.94, no.8, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 8
  • Publication Date: 2009
  • Doi Number: 10.1063/1.3093838
  • Title of Journal : APPLIED PHYSICS LETTERS

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 coexistence of superconductivity and ferromagnetism.