Nomura R, Gervais G, Haard TM, Lee Y, Mulders N, Halperin WP
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois, 60208, USA.
Phys Rev Lett. 2000 Nov 13;85(20):4325-8. doi: 10.1103/PhysRevLett.85.4325.
High-frequency ( approximately 15 MHz) acoustics were performed on 3He in 98% porous silica aerogel using an acoustic cavity technique. Measurements of the sound attenuation in the normal Fermi liquid and superfluid display behavior quite different from the bulk owing to strong elastic scattering of quasiparticles. The transition from first-to-zero sound is completely obscured with a quasiparticle mean-free path estimated to be in the range of 200-300 nm. No collective mode attenuation peak was observed at or below the superfluid transition.
使用声学腔技术，在98%孔隙率的二氧化硅气凝胶中的3He上进行了高频（约15兆赫兹）声学实验。由于准粒子的强弹性散射，正常费米液体和超流体中声衰减的测量结果显示出与体材料截然不同的行为。从第一声到零声的转变被完全掩盖，估计准粒子平均自由程在200 - 300纳米范围内。在超流转变温度及以下未观察到集体模衰减峰。
