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 i...
| Authors: | , , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2019 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/199865 |
| Online Access: | http://hdl.handle.net/10261/199865 |
| Access Level: | Open access |
| Keyword: | Electron-phonon coupling Optical phonons Superconducting fluctuations Superconducting phase transition Ultrafast phenomena Cuprates High-temperature superconductors Unconventional superconductors |
| 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 |
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