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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 21116
- DOI 10.1140/epjst/e2010-01298-7
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301919
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