Localized vibrations in superconducting YBa2Cu3O7 revealed by ultrafast optical coherent spectroscopy

Supplementary information for

Localised vibrations in superconducting YBCO revealed by ultra-fast

optical coherent spectroscopy

Fabio Novelli,1,2 _{Gianluca Giovannetti,}3 _{Adolfo Avella,}4,5 _{Federico Cilento,}2 _{Luc Patthey,}6 _Milan

Radovic,6,7 _{Massimo Capone,}3 _{Fulvio Parmigiani,}1,2,8 _{and Daniele Fausti}1,2,* 1 _{Department of Physics, Università degli Studi di Trieste, 34127 Trieste, Italy} 2 _{Sincrotrone Trieste SCpA, 34127 Basovizza, Italy}

3 _{CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi}

Avanzati (SISSA), Via Bonomea 265, 34136 Trieste, Italy

4 _{Dipartimento di Fisica, E.R. Caianiello - Unità CNISM di Salerno, Università degli Studi di Salerno,}

I-84084 Fisciano (SA), Italy

5 _{CNR-SPIN, UoS di Salerno, I-84084 Fisciano (SA), Italy}

6 _{SwissFEL, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland}

7 _{Institut de la Matiere Complexe, EPF Lausanne, CH-1015 Lausanne, Switzerland} 8 _{International Faculty, University of Cologne, Germany}

Supplementary Figure 1. Representative measurements for the time domain reflectivity as a function of the probe energy and time delay between pump and probe. Panels (a) and (b) are representative for low fluence and low temperature, in (c) low fluence and high temperature measurements are shown, and in panels (d) and (e) we report high fluence and low temperature results. The

Supplementary Figure 2. Example of the fit procedure employed to obtain the coherent part from the transient response. In a) we show the measurements of DR/R of the YBCO sample at T = 5 K and pump fluence of 20 µJ/cm2_{. In b) all the multiexponential fits are displayed for the same temperature}

and fluence. As an example, in c) we show the measurement (red) and the fit results (black) at the probe energy of 2 eV. Panels a) and b) share the same color axis shown in panel a of Supplementary Fig1 (the color scale goes from -0.5·10-2 _{to 1.5·10}-2_{, blue to red).}