Universität zu Köln

Novelli, Fabio ORCID: 0000-0002-0381-5585, Giovannetti, Gianluca, Avella, Adolfo ORCID: 0000-0002-3874-2216, Cilento, Federico ORCID: 0000-0002-4121-1694, Patthey, Luc ORCID: 0000-0001-6101-8069, Radovic, Milan ORCID: 0000-0003-4042-9648, Capone, Massimo ORCID: 0000-0002-9811-5089, Parmigiani, Fulvio and Fausti, Daniele (2017). Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy. Phys. Rev. B, 95 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The interaction between phonons and high-energy excitations of electronic origin in cuprates and their role in the superconducting mechanisms is still controversial. Here we use coherent vibrational time-domain spectroscopy together with density functional and dynamical mean-field theory calculations to establish a direct link between the c-axis phonon modes and the in-plane electronic charge excitations in optimally doped YBa2Cu3O7. The nonequilibrium Raman tensor ismeasured by means of the broadband coherent-phonon response in pump-probe experiments and is qualitatively described by our model using density functional theory in the frozen-phonon approximation plus single-band dynamical mean-field theory to account for the electronic correlations. The major outcome of our experimental and theoretical study is to establish the link between out-of-plane copper ion displacements and the in-plane electronic correlations, and to estimate at a few unit cells the correlation length of the associated phonon mode. The approach introduced here could help in revealing the complex interplay between fluctuations of different nature and spatial correlation in several strongly correlated materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Novelli, Fabio UNSPECIFIED orcid.org/0000-0002-0381-5585 UNSPECIFIED Giovannetti, Gianluca UNSPECIFIED UNSPECIFIED UNSPECIFIED Avella, Adolfo UNSPECIFIED orcid.org/0000-0002-3874-2216 UNSPECIFIED Cilento, Federico UNSPECIFIED orcid.org/0000-0002-4121-1694 UNSPECIFIED Patthey, Luc UNSPECIFIED orcid.org/0000-0001-6101-8069 UNSPECIFIED Radovic, Milan UNSPECIFIED orcid.org/0000-0003-4042-9648 UNSPECIFIED Capone, Massimo UNSPECIFIED orcid.org/0000-0002-9811-5089 UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Fausti, Daniele UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-230626
DOI:	10.1103/PhysRevB.95.174524
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	17
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INPLANE SPECTRAL WEIGHT; DISPLACIVE EXCITATION; THIN-FILMS; PHONONS; TIME; DYNAMICS; RELAXATION Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23062