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Ultrathin two-dimensional superconductivity with strong spin-orbit coupling.
Nam, Hyoungdo; Chen, Hua; Liu, Tijiang; Kim, Jisun; Zhang, Chendong; Yong, Jie; Lemberger, Thomas R; Kratz, Philip A; Kirtley, John R; Moler, Kathryn; Adams, Philip W; MacDonald, Allan H; Shih, Chih-Kang.
Affiliation
  • Nam H; Department of Physics, The University of Texas at Austin, Austin, TX 78712;
  • Chen H; Department of Physics, The University of Texas at Austin, Austin, TX 78712;
  • Liu T; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803;
  • Kim J; Department of Physics, The University of Texas at Austin, Austin, TX 78712;
  • Zhang C; Department of Physics, The University of Texas at Austin, Austin, TX 78712;
  • Yong J; Department of Physics, The Ohio State University, Columbus, OH 43210;
  • Lemberger TR; Department of Physics, The Ohio State University, Columbus, OH 43210;
  • Kratz PA; Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
  • Kirtley JR; Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
  • Moler K; Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
  • Adams PW; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803;
  • MacDonald AH; Department of Physics, The University of Texas at Austin, Austin, TX 78712; macd@physics.utexas.edu shih@physics.utexas.edu.
  • Shih CK; Department of Physics, The University of Texas at Austin, Austin, TX 78712; macd@physics.utexas.edu shih@physics.utexas.edu.
Proc Natl Acad Sci U S A ; 113(38): 10513-7, 2016 09 20.
Article in En | MEDLINE | ID: mdl-27601678
ABSTRACT
We report on a study of epitaxially grown ultrathin Pb films that are only a few atoms thick and have parallel critical magnetic fields much higher than the expected limit set by the interaction of electron spins with a magnetic field, that is, the Clogston-Chandrasekhar limit. The epitaxial thin films are classified as dirty-limit superconductors because their mean-free paths, which are limited by surface scattering, are smaller than their superconducting coherence lengths. The uniformity of superconductivity in these thin films is established by comparing scanning tunneling spectroscopy, scanning superconducting quantum interference device (SQUID) magnetometry, double-coil mutual inductance, and magneto-transport, data that provide average superfluid rigidity on length scales covering the range from microscopic to macroscopic. We argue that the survival of superconductivity at Zeeman energies much larger than the superconducting gap can be understood only as the consequence of strong spin-orbit coupling that, together with substrate-induced inversion-symmetry breaking, produces spin splitting in the normal-state energy bands that is much larger than the superconductor's energy gap.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Proc Natl Acad Sci U S A Year: 2016 Document type: Article
Fulltext
Add to My VHL
Print
XML
PubMed Links
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Proc Natl Acad Sci U S A Year: 2016 Document type: Article