Ultrafast relaxation in Y-Ba-Cu-O and Ni thin films studied by nonlinear spectroscopy technique

Bagratashvili, V.N.; Lobastov, V.A.; Zherikhin, A.; Petnikova, V.; Shuvalov, V.V.

Авторы: Bagratashvili V.N., Lobastov V.A., Zherikhin A., Petnikova V., Shuvalov V.V.
Сборник: ICONO'91, Mode-Locked Lasers and Ultrafast Phenomena
Том: 1842
Год издания: 1992
Место издания: SPIE
Первая страница: 64
Последняя страница: 69
DOI: 10.1117/12.131857
Аннотация: By picosecond spectrometer with two tunable dye lasers, high temperature superconducting (HTSC) (monocrystal Y-Ba-Cu-O with critical temperature Tc equals 87 K) and metal (Ni) thin films have been investigated. A self-diffraction process efficiency (eta) versus biharmonic pumping component detuning (Omega) has been measured at the temperature (Theta) equals 300 and 80 K. It is found that there is a well-defined dip on the dispersion curve (eta) ((Omega) ) for the HTSC films at (Theta) equals 80 K and -10 cm-1 (Omega) -50 cm-1. This region upper limit corresponds to a superconducting energy gap value 2(Delta) . At 10 cm-1 -1, any distinction of the same type is absent. In other respects all obtained dispersion curves are similar. They consist of the central peak ((eta) approximately equals 10-7, (Omega) -1) and wide wings ((eta) approximately equals 10-9, (Omega) 10 cm-1) with the interference structure. Y-Ba-Cu-O film resonances are coincided with the phonon mode frequencies (120, 335, and 580 cm equals -1). It is shown that photoexcitation kinetics (the sample ''darkening'') must consist of some components. A characteristic time of the most ''ultrafast'' component below 5 fs has been estimated and a complex subpicosecond quantum beats presence has been predicted
Добавил в систему: Шувалов Владимир Владимирович

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