Journal
PHYSICAL REVIEW B
Volume 102, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.054401
Keywords
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Funding
- Slovenian Research Agency [P1-0099, P1-0125, J1-9145, PR-07586]
- CO Nanocenter
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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 Se-77 nuclear magnetic resonance and Ta-181 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 T-c = 3.5 K and may, together with the underlying disorder, account for the large superconducting gap-to-T-c ratio 2 Delta/k(B)T(c) approximate to 7 deduced from the scanning tunneling microscopy.
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