Measurements of high-frequency sound propagation in /sup 3/He-B
Measurements of high-frequency sound propagation in /sup 3/He-B
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/sup 3/He-B 中高频声音传播的测量
DOI：
10.1103/physrevlett.45.266
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发表时间：
1980
影响因子：
8.6
通讯作者：
W. Halperin
中科院分区：
文献类型：
--
作者：
D. Mast;B. Sarma;J. Owers;I. Calder;J. Ketterson;W. Halperin
测量了脉冲高频声在超流/SUP3/He-B中高达133 MHz的衰减和速度。在外推到..omega..1.165=(plus-or-minus0.05)..delta../sub bcs/(T/subc/)的T/subc/(T/subc/)的频率处发现了有序参数的一个新的集体模，其中……/subbcs/(T)是弱耦合bcs理论中的能隙。观察到群速度降低了零声速的2/3。
Measurements of the attenuation and velocity of pulsed high-frequency sound have been performed up to 133 MHz in superfluid /sup 3/He-B. A new collective mode of the order parameter was discovered at a frequency extrapolated to T/sub c/ of ..omega..1.165=(plus-or-minus0.05)..delta../sub BCS/(T/sub c/), where ..delta../sub BCS/(T) is the energy gap in the weak-coupling BCS theory. The group velocity has been observed to decrease by as much as 2/3 of the zero-sound velocity.