Occurrence of superconductivity when the metal-insulator transition is inhibited in 1T-TaS{₂}

P. Xu , J. O. Piatek , P.-H. Lin , B. Sipos , H. Berger , L. Forr\'o , H. M. R{\o}nnow , M. Grioni

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classification ❄️ cond-mat.str-el cond-mat.supr-con

keywords inhibitedmetal-insulatorstatesuperconductivitytransitionwhenalmostamount

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When a Mott metal-insulator transition is inhibited by a small amount of disorder in the layered dichalcogenide 1T-TaS$_2$, an inhomogeneous superconducting state arises below T=2.1 K, and coexists with a nearly-commensurate charge-density-wave. By angle-resolved photoelectron spectroscopy (ARPES) we show that it emerges from a bad metal state with strongly damped quasiparticles. Superconductivity is almost entirely suppressed by an external magnetic field of 0.1 T.

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Occurrence of superconductivity when the metal-insulator transition is inhibited in 1T-TaS{₂}

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