Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates

Claudio Giannetti (), Federico Cilento, Stefano Dal Conte, Giacomo Coslovich, Gabriele Ferrini, Hajo Molegraaf, Markus Raichle, Ruixing Liang, Hiroshi Eisaki, Martin Greven, Andrea Damascelli, Dirk van der Marel and Fulvio Parmigiani
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Claudio Giannetti: Università Cattolica del Sacro Cuore
Federico Cilento: Università degli Studi di Trieste
Stefano Dal Conte: Università degli Studi di Pavia
Giacomo Coslovich: Università degli Studi di Trieste
Gabriele Ferrini: Università Cattolica del Sacro Cuore
Hajo Molegraaf: Faculty of Science & Technology, University of Twente
Markus Raichle: University of British Columbia
Ruixing Liang: University of British Columbia
Hiroshi Eisaki: Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
Martin Greven: School of Physics and Astronomy, University of Minnesota
Andrea Damascelli: University of British Columbia
Dirk van der Marel: Université de Genève
Fulvio Parmigiani: Università degli Studi di Trieste

Nature Communications, 2011, vol. 2, issue 1, 1-7

Abstract: Abstract In strongly correlated systems the electronic properties at the Fermi energy (EF) are intertwined with those at high-energy scales. One of the pivotal challenges in the field of high-temperature superconductivity (HTSC) is to understand whether and how the high-energy scale physics associated with Mott-like excitations (|E−EF|>1 eV) is involved in the condensate formation. Here, we report the interplay between the many-body high-energy CuO2 excitations at 1.5 and 2 eV, and the onset of HTSC. This is revealed by a novel optical pump-supercontinuum-probe technique that provides access to the dynamics of the dielectric function in Bi2Sr2Ca0.92Y0.08Cu2O8+δ over an extended energy range, after the photoinduced suppression of the superconducting pairing. These results unveil an unconventional mechanism at the base of HTSC both below and above the optimal hole concentration required to attain the maximum critical temperature (Tc).

Date: 2011
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DOI: 10.1038/ncomms1354

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