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- W2092762023 abstract "The linewidth caused by the interaction between two-level defects in glasses has been measured through the change in the phase velocity and in the attenuation of a high frequency (9 GHz) ultrasonic wave when another ultrasonic wave of neighbouring frequency propagates in the sample. Experiments were made on several borosilicate BK 7 samples at a temperature near 1.5 K. An anomalous dispersion and a decrease of the attenuation of the ultrasonic wave have been observed. From a systematic study of the linewidth as a function of the power of the two ultrasonic waves we are able to deduce a value of the relaxation rate Γ2. As different values have been reported, we use successively 2.6 x 10 -4 and 7 x 10-4 for the coupling constant [FORMULA] The results are Γ 2/2 π = 45 MHz and 20 MHz at 1.5 K. A comparison is made between these values and those obtained by others from desaturation experiments. In addition, we have emphasized the importance of spectral inhomogeneities in the material." @default.
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- W2092762023 date "1977-01-01" @default.
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- W2092762023 title "Linewidth and anomalous dispersion of ultrasound in glasses" @default.
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- W2092762023 doi "https://doi.org/10.1051/jphys:0197700380106900" @default.
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