Clocking the onset of bilayer coherence in a high-${T}_{c}$ cuprate
- Baldini, Edoardo Laboratory for Ultrafast Microscopy and Electron Scattering, IPHYS, EPFL, Lausanne, Switzerland - Laboratory of Ultrafast Spectroscopy, ISIC, EPFL, Lausanne, Switzerland
- Mann, Andreas Laboratory for Ultrafast Microscopy and Electron Scattering, IPHYS, EPFL, Lausanne, Switzerland
- Mallett, Benjamin P. P. Department of Physics, University of Fribourg, Switzerland
- Arrell, Christopher Laboratory of Ultrafast Spectroscopy, ISIC, EPFL, Lausanne, Switzerland
- Mourik, Frank van Laboratory of Ultrafast Spectroscopy, ISIC, EPFL, Lausanne, Switzerland
- Wolf, Thomas Institute of Solid State Physics, Karlsruhe Institute of Technology, Karlsruhe 76021, Germany
- Mihailovic, Dragan Jozef Stefan Institute and International Postgraduate School, Ljubljana, Slovenia
- Tallon, Jeffrey L. Robinson Research Institute, Victoria University of Wellington, Lower Hutt, New Zealand
- Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
- Lorenzana, José Institute for Complex Systems - CNR, and Physics Department, University of Rome “La Sapienza”, Italy
- Carbone, Fabrizio Laboratory for Ultrafast Microscopy and Electron Scattering, IPHYS, EPFL, Lausanne, Switzerland
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03.01.2017
Published in:
- Physical Review B. - 2017, vol. 95, no. 2, p. 024501
English
In cuprates, a precursor state of superconductivity is speculated to exist above the critical temperature TC. Here we show via a combination of far-infrared ellipsometry and ultrafast broadband optical spectroscopy that signatures of such a state can be obtained via three independent observables in an underdoped sample of NdBa2Cu3O6+δ. The pseudogap correlations were disentangled from the response of laser-broken pairs by clocking their characteristic time scales. The onset of a superconducting precursor state was found at a temperature TONS>TC, consistent with the temperature scale identified via static optical spectroscopy. Furthermore, the temperature evolution of the coherent vibration of the Ba ion, strongly renormalized by the onset of superconductivity, revealed a pronounced anomaly at the same temperature TONS. The microscopic nature of such a precursor state is discussed in terms of preformed pairs and enhanced bilayer coherence.
- 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 287940
- DOI 10.1103/PhysRevB.95.024501
- Persistent URL
- https://folia.unifr.ch/unifr/documents/305382
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