Phase diagram of single-crystalline tetragonal iron chalcogenides

Romain Viennois; Enrico Giannini; Dirk van Der Marel; Radovan Cerny

doi:10.1016/j.physc.2009.11.126

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Phase diagram of single-crystalline tetragonal iron chalcogenides

Romain Viennois, Enrico Giannini, Dirk van Der Marel et Radovan Cerny

Physica C, Vol.470(Supplement 1)

9th International Conference on Materials and Mechanisms of Superconductivity (Tokyo, Japan, 07/09/2009–12/09/2009)

27/11/2009

DOI: https://doi.org/10.1016/j.physc.2009.11.126

Résumé

We have drawn the phase diagram of tetragonal Fe1+xTe1-ySey based on the investigations carried on single-crystalline samples for yless-than-or-equals, slant0.5. Sizeable single-crystals were grown by self-flux melting in vacuum-sealed reactors and characterized by X-ray diffraction, electron microscopy, magnetic and transport measurements. Contrary to previous studies on polycrystalline samples, we found the magnetic transition to disappear only close to y=0.5, whereas superconductivity is found to occur at ygreater-or-equal, slanted0.45. Above a given threshold, strong electron correlations become detrimental to the appearance of superconductivity in this family of compounds. The appearance of superconductivity is favored at lower Se content by decreasing the Fe excess x. Highly pure superconducting crystals were grown starting from the nominal composition Fe0.9Te0.7Se0.3.

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Titre: Phase diagram of single-crystalline tetragonal iron chalcogenides
Créateurs - sans rôle: Romain Viennois - Université de Montpellier, Institut Charles Gerhardt Montpellier - ICGM
Enrico Giannini - University of Geneva
Dirk van Der Marel - University of Geneva
Radovan Cerny - University of Geneva
Détails de publication: Physica C, Vol.470(Supplement 1)
Colloque: 9th International Conference on Materials and Mechanisms of Superconductivity (Tokyo, Japan, 07/09/2009–12/09/2009)
Identifiants: 9943275909311
Unité académique: Institut Charles Gerhardt Montpellier - ICGM
Langue: English
Type de ressource: Conference proceeding
Champs locaux: hal-00542914