ISSN:
1573-7357
Schlagwort(e):
67.50.Fi
;
43.25.+y
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract Sound absorption of3He-B at 0 bar was studied at a frequency of 10 MHz. We performed pulsed experiments with different pulse lengths (4 to 15 μs) and pulse powers (0.1 to 160 μW) in the temperature range 0.2 〈 T/TC 〈 2. For pulse power less than pth ∼ 50 μW, and in the temperature range 0.4 to 0.8 Tc and zero field, the attenuation coefficient a decreases monotonically at about 0.2 cm−1 per decade of power. Above pth. α increases up to values of 3.5 cm−1 and 1.9 cm−1 at highest power for temperatures of 0.8 Tc and 0.4 Tc, respectively. At pulse power around 100 μW and at the lowest temperatures, the attenuation changes within the first 200 μs after the application of the pulse; α also increases with increasing field. In the normal fluid α decreases with increasing power. All of our observations are lacking a rigorous theoretical understanding.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00753388
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