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

Dubroka, A. ; Yu, L. ; Munzar, D. ; Kim, K.W. ; Rössle, M. ; Malik, V.K. ; Lin, C.T. ; Keimer, B. ; Wolf, Th ; Bernhard, C.

In: The European Physical Journal Special Topics, 2010, vol. 188, no. 1, p. 73-88

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    Title
    • Pseudogap and precursor superconductivity in underdoped cuprate high temperature superconductors: A far-infrared ellipsometry study
    Author
    • Dubroka, A.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    • Yu, L.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    • Munzar, D.. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic
    • Kim, K.W.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    • Rössle, M.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    • Malik, V.K.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    • Lin, C.T.. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569, Stuttgart, Germany
    • Keimer, B.. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569, Stuttgart, Germany
    • Wolf, Th. Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
    • Bernhard, C.. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, 1700, Fribourg, Switzerland
    Document Type
    • Postprint
    Classification
    • Physics
    OAI-PMH Identifier
    • oai:doc.rero.ch:311135
    Summary
    Abstract.: 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