Magnetic phase diagram of Fe1.1Te1-xSex: A comparative study with the stoichiometric superconducting FeTe1-xSex system

Abstract

We report a comparative study of the series Fe1.1Te1-xSex and the stoichiometric FeTe1-xSex to bring out the difference in their magnetic, superconducting and electronic properties. The Fe1.1Te1-xSex series is found to be magnetic and its microscopic properties are elucidated through Moessbauer spectroscopy. The magnetic phase diagram of Fe1.1Te1-xSex is traced out and it shows the emergence of spin-glass state when the antiferromagnetic state is destabilized by the Se substitution. The isomer shift and quadrupolar splitting obtained from the Moessbauer spectroscopy clearly brings out the electronic differences in these two series.

6 pages, 9 figures

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• Growth conditions, structure, and superconductivity of pure and metal-doped FeTe1-xSex single crystals
• Strong correlation and massive spectral-weight redistribution induced spin density wave in a-Fe1.06Te
• Microstructural magnetic phases in superconducting FeTe0.65Se0.35
• Superconductivity in oxygen-annealed FeTe1-xSx single crystal
• Magnetic excitations of Fe_{1+y}Se_xTe_{1-x} in magnetic and superconductive phases
• Nature of the bad metallic behavior of Fe_{1.06}Te inferred from its evolution in the magnetic state
• Superconductivity at 5.2 K in ZrTe3 polycrystals and the effect of Cu, Ag intercalation
• Superconductivity in PbO-type Fe chalcogenides
• Common origin of the two types of magnetic fluctuations in iron chalcogenides
• Single crystal growth and structural characterization of FeTe1-xSx
• Magnetic glassy phase in FeSeTe single crystals
• Interplay of electron correlation and covalency in FeTe(0.6)Se(0.4)
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Superconductivity in Single-Crystal YIn3