Controlling the near-surface superfluid density in underdoped YBa₂Cu₃O<sub>6+<i>x</i></sub> by photo-illumination

Stilp, E.; Suter, A.; Prokscha, T.; Salman, Z.; Morenzoni, E.; Keller, H.; Pahlke, P.; Hühne, R.; Bernhard, Christian; Liang, Ruixing; Hardy, W. N.; Bonn, D. A.; Baglo, J. C.; Kiefl, R. F.

doi:10.1038/srep06250

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Controlling the near-surface superfluid density in underdoped YBa₂Cu₃O_6+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

01.09.2014

Published in:

Scientific Reports. - 2014, vol. 4, no. 1, p. 6250

Superconducting properties and materials Surfaces

interfaces and thin films

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 YBa₂Cu₃O_6+x (YBCO) have shown an enhanced critical temperature T_c. 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

RERO DOC 233229
DOI 10.1038/srep06250

Persistent URL

https://folia.unifr.ch/unifr/documents/304013

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