Effect of external pressure on Tc of as‐grown and thermally treated superconducting Rbx Fe2–ySe2 single crystals

Kanagaraj, M.; Krztoń‐Maziopa, A.; Selvan, G.; Pomjakushina, E.; Conder, K.; Puźniak, R.; Arumugam, S.

doi:10.1002/pssr.201206426

Cited by 2 publications

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References 23 publications

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“…An as-grown crystal of Rb 0.85 Fe 1.9 Se 2 , subjected to a small external pressure, was found to show a clear enhancement of T c . However, the negative pressure effect on T c observed in the samples annealed close to the temperature of the phase separation and at about 50 K above it indicates that some relaxation of excess Fe magnetic moments into the Fe 2 Se 2 layers might have occurred [217].…”

Section: Impact Of External Factors On Superconducting State: Pressur...mentioning

confidence: 93%

Superconductivity in alkali metal intercalated iron selenides

Krztoń‐Maziopa

Svitlyk²,

Pomjakushina

et al. 2016

J. Phys.: Condens. Matter

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Alkali metal intercalated iron selenide superconductors A x Fe2-y Se2 (where A = K, Rb, Cs, Tl/K, and Tl/Rb) are characterized by several unique properties, which were not revealed in other superconducting materials. The compounds crystallize in overall simple layered structure with FeSe layers intercalated with alkali metal. The structure turned out to be pretty complex as the existing Fe-vacancies order below ~550 K, which further leads to an antiferromagnetic ordering with Néel temperature fairly above room temperature. At even lower temperatures a phase separation is observed. While one of these phases stays magnetic down to the lowest temperatures the second is becoming superconducting below ~30 K. All these effects give rise to complex relationships between the structure, magnetism and superconductivity. In particular the iron vacancy ordering, linked with a long-range magnetic order and a mesoscopic phase separation, is assumed to be an intrinsic property of the system. Since the discovery of superconductivity in those compounds in 2010 they were investigated very extensively. Results of the studies conducted using a variety of experimental techniques and performed during the last five years were published in hundreds of reports. The present paper reviews scientific work concerning methods of synthesis and crystal growth, structural and superconducting properties as well as pressure investigations.

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Section: Impact Of External Factors On Superconducting State: Pressur...mentioning

confidence: 93%