Superconductivity on the verge of Mott localization in ternary iron sulfide
classification
❄️ cond-mat.supr-con
cond-mat.str-el
keywords
electricalmottsuperconductivityanti-ferromagneticbecomescompoundsdiscoveredevolves
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We report the results of electrical and magnetic properties on two new compounds, K0.8Fe1.7S2 and K0.8Fe1.7SeS, both having similar structures to newly discovered superconducting K0.8Fe1.7Se2. K0.8Fe1.7S2 exhibits a semiconductor-like electrical property and undergoes an anti-ferromagnetic transition at about 260 K. Upon replacing half of S with Se, K0.8Fe1.7SSe becomes a superconductor at 25 K, implying the superconductivity evolves from a Mott AFM state in Fe-Se based superconductors.
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