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Controlling the near-surface superfluid density in underdoped YBa₂Cu₃O6+x by photo-illumination

  • Stilp, E. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI, Switzerland - Physik-Institut der Universität Zürich, Switzerlan
  • Suter, A. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI, Switzerland
  • Prokscha, T. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI, Switzerland
  • Salman, Z. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI, Switzerland
  • Morenzoni, E. Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen PSI, Switzerland
  • Keller, H. Physik-Institut der Universität Zürich, Switzerlan
  • Pahlke, P. Institut für Festkörperphysik, Technische Universität Dresden, Germany - Institute for Metallic Materials, IFW Dresden, Germany
  • Hühne, R. Institute for Metallic Materials, IFW Dresden, Germany
  • Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
  • Liang, Ruixing Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada - Canadian Institute for Advanced Research, Toronto, Ontario, Canada
  • Hardy, W. N. Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada - Canadian Institute for Advanced Research, Toronto, Ontario, Canada
  • Bonn, D. A. Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada - Canadian Institute for Advanced Research, Toronto, Ontario, Canada
  • Baglo, J. C. Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
  • Kiefl, R. F. Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
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    01.09.2014
Published in:
  • Scientific Reports. - 2014, vol. 4
English The interaction with light weakens the superconducting ground state in classical superconductors. The situation in cuprate superconductors is more complicated: illumination increases the charge carrier density, a photo-induced effect that persists below room temperature. Furthermore, systematic investigations in underdoped YBa₂Cu₃O6+x (YBCO) have shown an enhanced critical temperature Tc. Until now, studies of photo-persistent conductivity (PPC) have been limited to investigations of structural and transport properties, as well as the onset of superconductivity. Here we show how changes in the magnetic screening profile of YBCO in the Meissner state due to PPC can be determined on a nanometer scale utilizing low-energy muons. The data obtained reveal a strongly increased superfluid density within the first few tens of nanometers from the sample surface. Our findings suggest a non-trivial modification of the near-surface band structure and give direct evidence that the superfluid density of YBCO can be controlled by light illumination.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/304013
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