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VOLUME 21 (1975) | ISSUE 9 | PAGE 543
Three-pulse phonon (electroacoustic) echo with large relaxation time
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.