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VOLUME 29 (1979) | ISSUE 8 | PAGE 464
Microwave tunnel echo in glass
A microwave echo was observed for the first time in glass without magnetic impurities. A dependence of the echo signal on the magnetic field was obtained in glass with rare-earth impurities. It was found that the relaxation times decrease as a result of application of the field. It is assumed that the observed signals are due to the spectrum of low-frequency excitations caused by tunneling.