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Broad-band infrared ellipsometry measurements of the c-axis response of underdoped YBa2Cu3O7−δ: Spectroscopic distinction between the normal-state pseudogap and the superconducting gap |
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| Authors: | C Bernhard Li Yu KW Kim D Munzar CT Lin |
| Institution: | a Physics Department and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, CH-1700 Fribourg, CH, Switzerland b Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlárská 2, CZ-61137 Brno, CZ, Czech Republic c Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, D, Germany d Forschungszentrum Karlsruhe, IFP, D-76021 Karlsruhe, D, Germany |
| Abstract: | We present broad-band infrared ellipsometry measurements of the c-axis dielectric response of underdoped YBa2Cu3O7−d single crystals. Our data provide a clear spectroscopic distinction between the normal-state pseudogap and the superconducting gap. In particular, they establish that different energy scales are underlying the respective redistributions of spectral weight. Furthermore, our data are suggestive of a mutual competition between the two gaps and thus of an extrinsic nature of the pseudogap with respect to superconductivity. |
| Keywords: | A Superconductors C Infrared spectroscopic D Optical properties D Superconductivity |
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