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- W3083804919 abstract "Whether a metallic ground state exists in a two-dimensional system beyond Anderson localization remains an unresolved question. Recently, an intermediate anomalous metallic state is observed in several two-dimensional systems in the superconductor-insulator transition process. However, its origin remains enigmatic. In several models the systems are assumed to be composed of superconducting grains and insulating matrix. Thus the superconductor-insulator granular composites are important model system for studying the quantum metallic state. In this paper, we realized the intermediate metallic state in ultrathin Ta-SiO2 granular films by tuning disorder or applying magnetic field. It is found that the experimental sheet resistance data near the transitions from superconducting to anomalous metallic states and anomalous metallic to insulating states are consistent with the theoretical scaling relations of the Bose-metal model, and cannot be described by the predictions of other related models. Our results suggest that the intermediate anomalous metallic state in the two-dimensional granular films originates from strong dynamical gauge field fluctuations caused by the disorder and magnetic field." @default.
- W3083804919 created "2020-09-14" @default.
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- W3083804919 date "2020-12-02" @default.
- W3083804919 modified "2023-10-15" @default.
- W3083804919 title "Disorder and magnetic field induced Bose-metal state in two-dimensional <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Ta</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>SiO</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> granular films" @default.
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- W3083804919 doi "https://doi.org/10.1103/physrevb.102.224502" @default.
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