Journal
PHYSICAL REVIEW B
Volume 100, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.184302
Keywords
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Funding
- European Research Council (ERC) under the European Union [758461]
- Spanish MINECO [SEV-2015-0522, SEV-2015-0496]
- Ramon y Cajal programme [RYC-2013-14838]
- Fondo Europeo de Desarrollo Regional [FIS2015-67898-P, MAT2014-51778-C2-1-R]
- Fundacio Privada Cellex
- CERCA Programme/Generalitat de Catalunya
- European Research Council (ERC) [758461] Funding Source: European Research Council (ERC)
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We examine coherent phonons in a strongly driven sample of optimally-doped high temperature superconductor YBa2Cu3O7-delta. 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.
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