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Saito Y, Kasahara Y, Ye J, et al. Metallic ground state in an ion-gated two-dimensional superconductor. Science. 2015;350(6259):409-13doi: 10.1126/science.1259440.
Saito, Y., Kasahara, Y., Ye, J., Iwasa, Y., & Nojima, T. (2015). Metallic ground state in an ion-gated two-dimensional superconductor. Science (New York, N.Y.), 350(6259), 409-13. https://doi.org/10.1126/science.1259440
Saito, Yu, et al. "Metallic ground state in an ion-gated two-dimensional superconductor." Science (New York, N.Y.) vol. 350,6259 (2015): 409-13. doi: https://doi.org/10.1126/science.1259440
Saito Y, Kasahara Y, Ye J, Iwasa Y, Nojima T. Metallic ground state in an ion-gated two-dimensional superconductor. Science. 2015 Oct 23;350(6259):409-13. doi: 10.1126/science.1259440. Epub 2015 Oct 01. PMID: 26429881.
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Science. 2015 Oct 23;350(6259):409-13. doi: 10.1126/science.1259440. Epub 2015 Oct 01.

Metallic ground state in an ion-gated two-dimensional superconductor.

Science (New York, N.Y.)

Yu Saito, Yuichi Kasahara, Jianting Ye, Yoshihiro Iwasa, Tsutomu Nojima

Affiliations

  1. Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
  2. Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan. Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
  3. Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan. Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
  4. Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
  5. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

PMID: 26429881 DOI: 10.1126/science.1259440

Abstract

Recently emerging two-dimensional (2D) superconductors in atomically thin layers and at heterogeneous interfaces are attracting growing interest in condensed matter physics. Here, we report that an ion-gated zirconium nitride chloride surface, exhibiting a dome-shaped phase diagram with a maximum critical temperature of 14.8 kelvin, behaves as a superconductor persisting to the 2D limit. The superconducting thickness estimated from the upper critical fields is ≅ 1.8 nanometers, which is thinner than one unit-cell. The majority of the vortex phase diagram down to 2 kelvin is occupied by a metallic state with a finite resistance, owing to the quantum creep of vortices caused by extremely weak pinning and disorder. Our findings highlight the potential of electric-field-induced superconductivity, establishing a new platform for accessing quantum phases in clean 2D superconductors.

Copyright © 2015, American Association for the Advancement of Science.

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