Abstract
A pulsed electric field technique has been developed to explore the possibility of using electrically polarizable tunneling defects in crystals as generators of short pulses of phonons of discrete, tunable frequencies, and has been applied to KCl:Li+ and KCl:OH−. Phonons generated by the application of highvoltage pulses to one end of an impurity-doped sample are studied using bolometric detection. By measuring defect-lattice relaxation times it is concluded that in both KCl:Li+ and KCl:OH− at least half of the detected phonon energy is a result of generation at discrete frequencies. The remainder of the signal may be a result of panchromatic generation produced by other relaxation processes faster than could be resolved (≲ 1 nsec). Low-field relaxation times of 8 and 6.5 nsec were obtained for KCl:Li+ and KCl:OH− respectively, in reasonable agreement with previous estimates obtained with other techniques. These times exhibit electric field and temperature dependences consistent with a single-phonon relaxation model. Scattering by the Li+ and OH− impurities resulted in considerable temporal broadening of the phonon pulses.
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Work supported by the U.S. Atomic Energy Commission under Contract AT(11-1)-3151, Technical Report No. CH-3151-139. Additional support was received from the Advanced Research Projects Agency through the use of space and technical facilities of the Materials Science Center at Cornell University, MSC Report No. 1714.
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Goubau, W.M. Phonon generation in KCl:Li+ and KCl:OH− with pulsed electric fields. J Low Temp Phys 14, 529–543 (1974). https://doi.org/10.1007/BF00658878
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DOI: https://doi.org/10.1007/BF00658878