Journal article

Pseudogap and precursor superconductivity in underdoped cuprate high temperature superconductors: A far-infrared ellipsometry study

  • Dubroka, Adam Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Yu, Li Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Munzar, Dominik Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno, Czech Republic
  • Kim, KyungWan Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Rössle, Matthias Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Malik, Vivek Kumar Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Lin, C.T. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Keimer, B. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Wolf, Th. Karlsruhe Institute of Technology, Karlsruhe, Germany
  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
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    11.10.2010
Published in:
  • The European Physical Journal - Special Topics. - 2010, vol. 188, no. 1, p. 73-88
English With the technique of infrared ellipsometry we performed a detailed study of the temperature- and doping dependence of the c-axis response of a series of YBa₂Cu₃O7−δ single crystals. In particular, we explored the anomalous electronic properties at temperatures above the macroscopic superconducting transition temperature, T c, whose conflicting explanations range from a precursor superconducting state to electronic correlations that compete with superconductivity. We show that the c-axis spectra provide evidence that both kinds of correlations are present and that their contributions can be disentangled based on an analysis with a so-called multilayer-model. We find that the onset temperature, T *, and the energy scale, ΔPG, of the competing pseudogap increase rapidly towards the underdoped side whereas they vanish on the overdoped side. In addition, we provide evidence that in a strongly underdoped sample the precursor superconducting correlations develop below an onset temperature, T ons, that is considerably lower than T * but still much higher than T c.
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/301919
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