Abstract
Coherent electric echo magnitudes and decay rates have been studied in gamma-irradiated natural quartz crystals in the 5–25 mK range at a frequency of 360 MHz. The echo experiments indicate the presence of two kinds of paraelectric centers. The dynamics of the two-level systems associated with aluminum centers is discussed. The tunneling centers possess rather long phase memory timeT 2 in the millikelvin temperature range (T 2 ∼10−5 sec at 10 mK) andT 2 is inversely proportional to the temperature.T 2 originates from dipolar interactions between the paraelectric centers, and spectral diffusion governs the decay of both the spontaneous and the stimulated echo.
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Saint-Paul, M., Joffrin, J. Electric dipole echoes in smoky quartz at very low temperatures. J Low Temp Phys 49, 195–212 (1982). https://doi.org/10.1007/BF00681587
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DOI: https://doi.org/10.1007/BF00681587