Quantum phase transitions in highly crystalline two-dimensional superconductors

Nature Communications
Yu SaitoYoshihiro Iwasa

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.

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Citations

Aug 14, 2019·Nature Communications·Yi LiuJian Wang
Mar 23, 2019·Science Advances·I TamirD Shahar
Nov 6, 2020·Scientific Reports·Iryna ZaytsevaMarta Z Cieplak
Apr 17, 2021·Nature Materials·Zhuangchai LaiHua Zhang

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