Superconducting critical fields of single-crystalline K0.73Fe1.68Se2

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

doi:10.1103/PhysRevB.84.052503

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Superconducting critical fields of single-crystalline K0.73Fe1.68Se2

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

DOI 10.1103/PhysRevB.84.052503 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K0.73Fe1.68Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	onset
K0.8Fe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	onset
K0.8Fe1.76Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl0.58Rb0.42Fe1.72Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown