Probing the lattice anharmonicity of superconducting YBa2Cu3O7−δ via phonon harmonics

We examine coherent phonons in a strongly driven sample of optimally-doped high temperature superconductor YBa2Cu3O7−δ. We observe a nonlinear lattice response of the 4.5 THz copper-oxygen vibrational mode at high excitation densities, evidenced by the observation of the phonon third harmonic and in...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2019-11, Vol.100 (18), p.1
Main Authors: Ramos-Alvarez, Alberto, Fleischmann, Nina, Vidas, Luciana, Fernandez-Rodriguez, Alejandro, Palau, Anna, Wall, Simon
Format: Article
Language:English
Subjects:
Anharmonicity
Charge transfer
High temperature superconductors
Nonlinear response
Phonons
Superconductivity
YBCO superconductors
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We examine coherent phonons in a strongly driven sample of optimally-doped high temperature superconductor YBa2Cu3O7−δ. We observe a nonlinear lattice response of the 4.5 THz copper-oxygen vibrational mode at high excitation densities, evidenced by the observation of the phonon third harmonic and indicating the mode is strongly anharmonic. In addition, we observe how high-amplitude phonon vibrations modify the position of the electronic charge transfer resonance. Both of these results have important implications for possible phonon-driven nonequilibrium superconductivity.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.184302