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Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe
Dona Cherian1, S Rößler, S Wirth
1Department of Physics, Indian Institute of Science, C V Raman Ave, Bengaluru, Karnataka 560012, India.
Abstract:
We investigated the evolution of the temperature-composition phase diagram of Fe(1+y)Te upon Se substitution. In particular, the effect of Se substitution on the two-step, coupled magneto-structural transition in Fe(1+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.
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