Intermediate bosonic metallic state in the superconductor-insulator transition
Authors/Creators
- 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
- 2. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
- 3. Institute for Advanced Study, Tsinghua University, Beijing 100084, China.
- 4. Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China
- 5. School of Engineering, Brown University, 182 Hope Street, Providence, RI02912, USA
- 6. Department of Physics, Brown University, 182 Hope Street, Providence, RI 02912, USA.
Description
Whether a metallic ground state exists in a two-dimensional system beyond Anderson localization remains an unresolved question. Here, we study how quantum phase coherence evolves across superconductor-metal-insulator transitions via magneto-conductance quantum oscillations in nanopatterned high-temperature superconducting films. We tune the degree of phase coherence by varying the etching time of our films. Between the superconducting and insulating regimes, we detect a robust intervening anomalous metallic state characterized by saturating resistance and oscillation amplitude at low temperatures. Our measurements suggest that the anomalous metallic state is bosonic and that the saturation of phase coherence plays a prominent role in its formation.
Files
Files
(8.6 MB)
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