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Mixing of low-frequency Raman-active phonons studied by femtosecond pump–probe spectroscopy |
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| Authors: | O V Misochko K Kisoda H Harima K Mizoguchi K Sakai and S Nakashima |
| Institution: | a Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow, Russian Federation b Department of Applied Physics, Osaka University, Osaka 565-0871, Japan c Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Kobe, Hyogo 651-2401, Japan |
| Abstract: | We report an optical study of the superconducting transition in the YBa2Cu3O7?x films on MgO substrate carried out by femtosecond pump–probe spectroscopy. In both the normal and the superconducting state, we have observed the transient time-resolved reflectivity caused by the oscillations associated with two A1g metal-ion modes. Temporal interference between the modes is modified below the phase transition, which also appeared in an altered relative intensity of the modes in the Fourier transformed spectra. |
| Keywords: | Femtosecond time-resolved spectroscopy Lattice dynamics High-Tc superconductors |
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