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The experimental research of the longitudinal ultrasound absorption in anintermediate state of the high pure Ga single crystal at the frequencies of 30- 130 MHz at the temperatures of 0.4 - 0.5 K, using the impulse method, iscompleted. The new effects in the absorption of ultrasound in an intermediatestate of the high pure type I superconductor are discovered. The giantoscillations in the dependence of the ultrasound absorption on the magneticfield at the magnitudes below the critical magnetic field, H < Hc, in anintermediate state of the high pure Ga single crystal are experimentallyobserved The maximum of the monotonic part of the ultrasound absorption on themagnetic field is also obtained. The additional experimental results in thedependence of the ultrasound absorption on the frequency of longitudinalultrasonic wave f and on the orientation of external magnetic field arereported. In the case of the high frequencies ultrasonic signal, the differentbehaviour of the monotonous part of the dependence of the ultrasound absorptionon the magnetic field in an intermediate state, comparing to the theoreticalprediction [10], is found. The anomalous distinction in the dependence of theultrasound absorption on the orientation of magnetic field in an intermediatestate of Ga in comparison with the dependence of the ultrasound absorption in anormal state of Ga at the same temperature and at the magnitude of magneticfield equal to the critical magnetic field, H = Hc, is observed. The possibletheoretical mechanisms to explain the nature of big oscillations in thedependence in an intermediate state of the high pure type I superconductor areproposed.

Experimental research of longitudinal ultrasound absorption in intermediate state of high pure type I superconductor