Acoustic and acoustoelectric studies of manganite films

Abstract We report on acoustic and acoustoelectric (AE) studies of La 0.67 Ca 0.33 MnO 3 (LCMO) films deposited on a LiNbO 3 substrate. Surface acoustic wave (SAW) attenuation in the LCMO films has been measured at different sound frequencies in the wide temperature range. Our measurements confirm the hole-like conductivity in La 0.67 Ca 0.33 MnO 3 films and reveal an anomalous (even in the SAW wave vector) contribution to the AE effect, which coexists with the ordinary (odd) effect. The anomalous AE effect is shown to be due to a strong modulation of the film conductivity produced by elastic deformations carried by the SAW.