Abstract
Twin dynamics forced by acoustic waves shows several linear and nonlinear response modes below T_{c}=106 K. In the quantum paraelectric state a "quantum domain glass" at 25 K<T<40 K shows intense relaxation and temperature hysteresis. Domains float collectively in a complex, smooth landscape with long relaxation times. In the "quantum domain solid" state below 25K new phenomena occur. A temperature-dependent memory effect of the elastic response after anneal at 36K depends on the lowest temperature reached in the quantum domain solid state below 25K. The glassiness of twin boundary dynamics vanishes for temperatures approaching absolute zero.
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