Abstract
Sound attenuation and velocity in sintered silver powders with and without liquid 4He and those with solid 4He have been measured by using a phase-sentitive ultrasonic system. When the sample was immersed in liquid 4He, the sound attenuation increased sharply at 4.2 K, kept a constant level with lowering temperature, and then decreased gradually below Tλ. On the other hand, in the sample without liquid 4He, the attenuation was almost independent of temperature. The velocity in the sample with liquid 4He was about 0.28% smaller than that without liquid 4He at 4.2 K. Below the surperfluid transition temperature the velocity gradually increased up to a constant value.
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