Evidence for two separate energy gaps in underdoped high-temperature cuprate superconductors from broadband infrared ellipsometry
- Yu, Li Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Max-Planck-Institute for Solid State Research, Stuttgart, Germany
- Munzar, D. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno, Czech Republic
- Boris, A. V. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
- Yordanov, P. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
- Chaloupka, J. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno, Czech Republic
- Wolf, Th. Forschungszentrum Karlsruhe, Germany
- Lin, C. T. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
- Keimer, B. Max-Planck-Institute for Solid State Research, Stuttgart, Germany
- Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Max-Planck-Institute for Solid State Research, Stuttgart, Germany
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02.05.2008
Published in:
- Physical Review Letters. - 2008, vol. 100, p. 177004
cuprate superconductors
optical properties of superconductors
optical properties of bulk materials and thin films
infrared and Raman spectra (condensed matter)
English
We present broadband infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa₂Cu₃O₇₋δ (R=Y, Nd, and La) single crystals. Our data show that separate energy scales are underlying the redistributions of spectral weight due to the normal state pseudogap and the superconducting gap. Furthermore, they provide evidence that these gaps do not share the same electronic states and do not merge on the overdoped side. Accordingly, our data are suggestive of a two gap scenario with a pseudogap that is likely extrinsic with respect to superconductivity.
- 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 10583
- DOI 10.1103/PhysRevLett.100.177004
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300790
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