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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
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/305382
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