Superconductivity emerging upon Se doping of the quantum spin liquid 1TTaS2

Izidor Benedičič, Nejc Janša, Marion van Midden, Peter Jeglič, Martin Klanjšek, Erik Zupanič, Zvonko Jagličić, Petra Šutar, Peter Prelovšek, Dragan Mihailovič, and Denis Arčon
Phys. Rev. B 102, 054401 – Published 3 August 2020

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/kBTc7 deduced from the scanning tunneling microscopy.

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  • Received 13 May 2020
  • Revised 10 July 2020
  • Accepted 13 July 2020

DOI:https://doi.org/10.1103/PhysRevB.102.054401

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Izidor Benedičič1, Nejc Janša1, Marion van Midden1, Peter Jeglič1, Martin Klanjšek1, Erik Zupanič1, Zvonko Jagličić2,3, Petra Šutar1, Peter Prelovšek1,4, Dragan Mihailovič1,4, and Denis Arčon1,4,*

  • 1Institute Jožef Stefan, Jamova c. 39, SI-1000 Ljubljana, Slovenia
  • 2Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova c. 2, SI-1000 Ljubljana, Slovenia
  • 3Institute of Mathematics, Physics and Mechanics, Ljubljana, Jadranska c. 19, SI-1000, Slovenia
  • 4Faculty of Mathematics and Physics, University of Ljubljana, Jadranska c. 19, SI-1000 Ljubljana, Slovenia

  • *denis.arcon@ijs.si

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Vol. 102, Iss. 5 — 1 August 2020

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