Abstract
Abstract Excess iron in Fe 1+x Se superconductor plays a crucial role in the observation of superconductivity in this material. We have investigated the effect of off-stoichiometry at the Fe site in Fe 1+x Se 0.5 Te 0.5 ( x = -0.01, 0.01 and 0.03) superconductor through magnetization, electrical transport and specific heat measurements. Our results indicate an improvement in the superconducting properties in Fe-deficient compound compared to the stoichiometric or Fe-rich compounds, in contrast to what is observed in the parent compound, FeSe.
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