Abstract
Spontaneous phonon echoes in dysprosium-doped glasses have been studied. A non-exponential decay of the echo is reported. It is explained by assuming the existence of tunneling states with very short relaxation times which attenuate strongly the phonon echo generated by the standard tunneling states. This behaviour is assigned to the Kramers ions which interact strongly with some tunneling states. The results of a hole-burning experiment are reported and the effect of a magnetic field is also considered.
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