Phase diagram of single-crystalline tetragonal iron chalcogenides

Viennois, Romain; Giannini, Enrico; Van Der Marel, Dirk; Cerny, Radovan

doi:10.1016/j.physc.2009.11.126

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Title		Phase diagram of single-crystalline tetragonal iron chalcogenides
Authors		Viennois, Romain Giannini, Enrico Van Der Marel, Dirk Cerny, Radovan
Published in		Physica C: Superconductivity and Its Applications. 2010, vol. 470, p. 370-371
Abstract		We have drawn the phase diagram of tetragonal Fe1+xTe1-ySeyFe1+xTe1-ySey based on the investigations carried on single-crystalline samples for y⩽0.5y⩽0.5. 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=0.5y=0.5, whereas superconductivity is found to occur at y⩾0.45y⩾0.45. 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 Fe0.9Te0.7Se0.3Fe0.9Te0.7Se0.3.
Keywords		Fe-based superconductors — PbO-based structure — Magnetism — Superconductivity
Identifiers		DOI: 10.1016/j.physc.2009.11.126
Full text		Article (Published version) (260 Kb) - Limited access to UNIGE Other version: http://linkinghub.elsevier.com/retrieve/pii/S0921453409008430
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation (ISO format)		VIENNOIS, Romain et al. Phase diagram of single-crystalline tetragonal iron chalcogenides. In: Physica C: Superconductivity and Its Applications, 2010, vol. 470, p. 370-371. https://archive-ouverte.unige.ch/unige:35438