Three-pulse phonon (electroacoustic) echo with large relaxation time
Popov S.N. , Krainik N.N., Smolenskii G.A.
It was observed that stimulated three-pulse phonon echoes of the type Γ+ τ in crystalline powders of piezoelectrics can be observed at room temperature by applying a third pulse many days after a single application of the first two pulses. The possible nature of this phenomenon is discussed.