Pseudogap and precursor superconductivity in underdoped cuprate high temperature superconductors: A far-infrared ellipsometry study |
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Authors: | A.?Dubroka L.?Yu D.?Munzar K.W.?Kim M.?R?ssle V.K.?Malik C.T.?Lin B.?Keimer Th.?Wolf C.?Bernhard |
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Affiliation: | 1.Department of Physics and Fribourg Center for Nanomaterials,University of Fribourg,Fribourg,Switzerland;2.Institute of Condensed Matter Physics, Faculty of Science,Masaryk University,Brno,Czech Republic;3.Max-Planck-Institut für Festk?rperforschung,Stuttgart,Germany;4.Karlsruhe Institute of Technology,Karlsruhe,Germany |
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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. |
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