Superconductivity emerging upon Se doping of the quantum spin liquid 1T−TaS2
Izidor Benedičič, Nejc Janša, Marion van Midden, Peter Jeglič, Martin Klanjšek, Erik Zupanič, Zvonko Jagličić, Petra Šutar, Peter Prelovšek, Dragan Mihailovič, Denis Arčon
DOI 10.1103/PhysRevB.102.054401 · Physical Review B
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Abstract
Paradigmatic quantum spin liquid has been in the past closely linked to the high-temperature superconductivity. Here we focus on a layered 1T-TaS2, which has recently emerged as a surprising candidate for a quantum spin liquid on a triangular lattice. Upon doping 1T-TaS2 with Se, the Se77 nuclear magnetic resonance and Ta181 nuclear quadrupole resonance data show a remarkable robustness of the quantum spin liquid at low Se doping levels despite the growth of inhomogeneities in the electronic state. A dramatic change in the low-energy electronic excitations are observed in samples with a moderate Se content where the Mott insulating state gives way to a correlated metal and a low-temperature superconductivity. The effects of antiferromagnetic correlations can still be traced in the normal state above the superconducting critical temperature Tc=3.5K and may, together with the underlying disorder, account for the large superconducting gap-to-Tc ratio 2Δ/kBTc≈7 deduced from the scanning tunneling microscopy.
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