Probing the lattice anharmonicity of superconducting YBa2Cu3O7−δ via phonon harmonics
Alberto Ramos-Alvarez, Nina Fleischmann, Luciana Vidas, Alejandro Fernandez-Rodriguez, Anna Palau, Simon Wall
DOI 10.1103/PhysRevB.100.184302 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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