  We have studied acoustoelectric (AE) effect produced by surface acoustic
waves (SAW) in a monolithic layered structure, composed of piezodielectric
LiNbO_{3} substrate and La_{0.67}Ca_{0.33}MnO_{3} film. The experiments
unexpectedly revealed in the longitudinal AE effect an anomalous contribution,
invariant upon reversal of SAW propagation, which coexists with the ordinary
(odd in wave vector) effect. The anomalous effect dominates near the
metal-insulator transition, while the ordinary effect prevails at high and low
temperatures. We show that the anomalous effect is caused by strong modulation
of the film conductivity produced by the SAW elastic deformations.
