Compressibility and pressure-induced disorder in superconducting phase-separated Cs0.72Fe1.57Se2

V. Svitlyk; D. Chernyshov; A. Bosak; E. Pomjakushina; A. Krzton-Maziopa; K. Conder; V. Pomjakushin; V. Dmitriev; G. Garbarino; M. Mezouar

doi:10.1103/PhysRevB.89.144106

Compressibility and pressure-induced disorder in superconducting phase-separated Cs0.72Fe1.57Se2

V. Svitlyk, D. Chernyshov, A. Bosak, E. Pomjakushina, A. Krzton-Maziopa, K. Conder, V. Pomjakushin, V. Dmitriev, G. Garbarino, M. Mezouar

DOI 10.1103/PhysRevB.89.144106 · Physical Review B

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Abstract

The pressure-dependent diffraction response of the superconducting phase-separated Cs0.72Fe1.57Se2 (Tc = 28.5 K) has been studied at room temperature using synchrotron radiation up to the pressure of 19 GPa. The main and secondary phases of Cs0.72Fe1.57Se2 have been observed in the whole pressure range. The main ordered phase has been found to undergo an order-disorder transition in the Fe sublattice at P = 11 GPa with the corresponding kinetics on the order of hours. Contrary to the analogous temperature-induced transition, the secondary phase has not been suppressed suggesting that its stability pressure range is higher than 19 GPa or the corresponding transformation kinetics is too slow at room temperature. Together with the previously reported pressure-dependent resistivity and magnetic susceptibility measurements, this work indicates that superconductivity in the AxFe2−ySe2 (A: alkali metals) phases could be related to the Fe-vacancy ordering in the main phase.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Cs0.72Fe1.57Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28.5	Pressure not reported	onset
Cs0.83Fe1.72Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
K0.8Fe1.7Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32.5	Pressure not reported	unknown
K0.6Fe1.5Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
Rb0.93Fe1.70Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
Rb0.8Fe1.6Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32.4	Pressure not reported	unknown
K0.8Fe1.78Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
K0.8Fe1.7Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	48.7	10.5 GPa	unknown
K0.8Fe1.78Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	48.7	10.5 GPa	unknown
Tl0.6Rb0.4Fe1.67Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown