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DS: Fachverband Dünne Schichten
DS 26: Oxides
DS 26.6: Talk
Thursday, March 29, 2007, 16:15–16:30, H34
Ag-doped LaPbMnO3 thin films and laser induced thermoelectric voltages — •Pengxiang Zhang1,2, Songlin Tan2, Hui Zhang2, and Hanns-Urlich Habermeier1 — 1Max-Planck Institut for Solid State Research, Stuttgart, D-70569 — 2IAMPE, KUST, Kunimng, China 650051
Ag-doped LaPbMnO3 thin films were grown on vicinal cut substrates by PLD technique. Laser induced voltages were measured for the first time in these thin films. It was proved that the laser induced voltages are due to the anisotropic thermoelectric effect, similar to that observed in YBa2Cu3O7 by Chang et al in 1990 and that in LaCaMnO3 by H.-U. Habermeier et al in 1998. It was found that with increasing Ag-doping from 0 to 10 wt%, the laser induced thermoelectric voltages (LITV) are firstly increased and then reduced, while the FWHM (to) of the time response of the induced voltages become smaller than that of pure LaPbMnO3 thin film, and demonstrate a minimum at 6 wt% of Ag-doping. Defining a figure of merit (Fm) for the performance of LITV devices used in pulsed laser detection: Fm = Up/to, where Up is the peak value of LITV, it was found that 6 wt% Ag-doping sample shows a maximum Fm. The short time response of the Ag-doped LaPbMnO3 thin films in LITV was explained by the increased electric conductivity, hence the higher thermo-conductivity in these thin films.