Superconducting critical fields of single-crystalline K 0.73Fe1.68Se2

M. I. Tsindlekht*, I. Felner, M. Zhang, A. F. Wang, X. H. Chen

*Corresponding author for this work

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Abstract

We report the results of an experimental study of dc and low-frequency magnetic properties of a K0.8Fe2-ySe2 single crystal when the dc magnetic field is applied parallel to the ab plane. From the data obtained, we deduce the full H-T phase diagram, which consists of all three Hc1(T), Hc2(T), and Hc3(T) critical magnetic-field plots. The two Hc1(T) and Hc2(T) curves were obtained from dc magnetic measurements, whereas the surface critical-field Hc3(T) line was extracted by ac susceptibility studies. It appears that near Tc, the Hc3(T)/Hc2(T) ratio is ≈4.4, which is much larger than expected.

Original languageEnglish
Article number052503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
StatePublished - 8 Aug 2011

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