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Schlagwörter:
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Zusammenfassung:
We investigated the evolution of the temperature-composition phase
diagram of Fe1+y Te upon Se substitution. In particular, the effect of
Se substitution on the two-step, coupled magneto-structural transition
in Fe1+y Te single crystals is investigated. To this end, the nominal Fe
excess was kept at y = 0.12. For low Se concentrations, the two
magneto-structural transitions displayed a tendency to merge. In spite
of the high Fe-content, superconductivity emerges for Se concentrations
x >= 0.1. We present a temperature-composition phase diagram to
demonstrate the interplay of structure, magnetism and superconductivity
in these ternary Fe-chalcogenides.
