Common Crystalline and Magnetic Structure of Superconducting A2Fe4Se5 (A=K,Rb,Cs,Tl) Single Crystals Measured Using Neutron Diffraction

F. Ye; S. Chi; Wei Bao; X. F. Wang; J. J. Ying; X. H. Chen; H. D. Wang; C. H. Dong; Minghu Fang

doi:10.1103/PhysRevLett.107.137003

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Common Crystalline and Magnetic Structure of Superconducting A2Fe4Se5 (A=K,Rb,Cs,Tl) Single Crystals Measured Using Neutron Diffraction

F. Ye, S. Chi, Wei Bao, X. F. Wang, J. J. Ying, X. H. Chen, H. D. Wang, C. H. Dong, Minghu Fang

DOI 10.1103/PhysRevLett.107.137003 · Physical Review Letters

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Abstract

Single-crystal neutron diffraction studies on superconductors A2Fe4Se5, where A=Rb, Cs, (Tl, Rb), and (Tl, K) (Tc∼30 K), uncover the same Fe vacancy ordered crystal structure and the same block antiferromagnetic order as in K2Fe4Se5. The Fe order-disorder transition occurs at TS=500–578 K, and the antiferromagnetic transition at TN=471–559 K with an ordered magnetic moment ∼3.3μB/Fe at 10 K. Thus, all recently discovered A intercalated iron selenide superconductors share the common crystalline and magnetic structure, which are very different from previous families of Fe-based superconductors, and constitute a distinct new 245 family.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Rb2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
Cs2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29	Pressure not reported	unknown
(Tl,K)2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	unknown
(Tl,Rb)2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
K2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
Cs0.8Fe2Se1.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28.5	Pressure not reported	unknown