Quantum phase transitions in highly crystalline two-dimensional superconductors
Open Access
- 22 February 2018
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 9 (1), 1-7
- https://doi.org/10.1038/s41467-018-03275-z
Abstract
Superconductor–insulator transition is one of the remarkable phenomena driven by quantum fluctuation in two-dimensional (2D) systems. Such a quantum phase transition (QPT) was investigated predominantly on highly disordered thin films with amorphous or granular structures using scaling law with constant exponents. Here, we provide a totally different view of QPT in highly crystalline 2D superconductors. According to the magneto-transport measurements in 2D superconducting ZrNCl and MoS2, we found that the quantum metallic state commonly observed at low magnetic fields is converted via the quantum Griffiths state to the weakly localized metal at high magnetic fields. The scaling behavior, characterized by the diverging dynamical critical exponent (Griffiths singularity), indicates that the quantum fluctuation manifests itself as superconducting puddles, in marked contrast to the thermal fluctuation. We suggest that an evolution from the quantum metallic to the quantum Griffiths state is generic nature in highly crystalline 2D superconductors with weak pinning potentials.This publication has 32 references indexed in Scilit:
- Highly crystalline 2D superconductorsNature Reviews Materials, 2016
- Nature of the quantum metal in a two-dimensional crystalline superconductorNature Physics, 2015
- Metallic ground state in an ion-gated two-dimensional superconductorScience, 2015
- Strongly enhanced charge-density-wave order in monolayer NbSe2Nature Nanotechnology, 2015
- Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert AtmosphereNano Letters, 2015
- Superconducting Dome in a Gate-Tuned Band InsulatorScience, 2012
- SUPERCONDUCTOR-INSULATOR TRANSITIONSInternational Journal of Modern Physics B, 2010
- High-temperature interface superconductivity between metallic and insulating copper oxidesNature, 2008
- Superconducting Interfaces Between Insulating OxidesScience, 2007
- Quantum phase transitions in disordered two-dimensional superconductorsPhysical Review Letters, 1990