Journal article

Evidence for two separate energy gaps in underdoped high-temperature cuprate superconductors from broadband infrared ellipsometry

  • Yu, Li Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Munzar, D. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno, Czech Republic
  • Boris, A. V. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Yordanov, P. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Chaloupka, J. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno, Czech Republic
  • Wolf, Th. Forschungszentrum Karlsruhe, Germany
  • Lin, C. T. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Keimer, B. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Max-Planck-Institute for Solid State Research, Stuttgart, Germany
Show more…
    02.05.2008
Published in:
  • Physical Review Letters. - 2008, vol. 100, p. 177004
English We present broadband infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa₂Cu₃O₇₋δ (R=Y, Nd, and La) single crystals. Our data show that separate energy scales are underlying the redistributions of spectral weight due to the normal state pseudogap and the superconducting gap. Furthermore, they provide evidence that these gaps do not share the same electronic states and do not merge on the overdoped side. Accordingly, our data are suggestive of a two gap scenario with a pseudogap that is likely extrinsic with respect to superconductivity.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300790
Statistics

Document views: 14 File downloads:
  • bernhard_ese.pdf: 1