Probing Andreev Reflection in Superfluid 3He-B Using a Quartz Tuning Fork
Probing Andreev Reflection in Superfluid 3He-B Using a Quartz Tuning Fork
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DOI：
10.1007/s10909-008-9815-5
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发表时间：
2008-07
影响因子：
2
通讯作者：
D. Bradley;M. Človečko;E. Gažo;P. Skyba
中科院分区：
文献类型：
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作者：
D. Bradley;M. Človečko;E. Gažo;P. Skyba
使用石英音叉直接测量 0.5 bar 弹道状态下超流体 3He-B 中准粒子激发的 Andreev 反射。根据这些测量结果，我们能够确定比率 Δ(0)/kTc 的值为 1.71，与之前的测量结果相当一致。此外，激励的安德烈夫反射似乎提供了确定表征速度场轮廓的常数λ的值的可能性。音叉的该值估计为 1.28，与圆柱形线的值 (λ∼0.95) 不同，表明反相振荡运动和音叉的几何形状导致超流体流动速度的增强。
Direct measurements of the Andreev reflection of the quasiparticles excitations in superfluid3He-B in the ballistic regime at 0.5 bar using a quartz tuning fork are presented. Based on these measurements, we were able to determine the value of the ratioΔ(0)/kTcto be 1.71, in reasonable agreement with previous measurements. Moreover, it seems that Andreev reflection of excitations gives a possibility to determine the value of the constantλcharacterizing the velocity field profile. This value for a tuning fork was estimated to be 1.28, different from that for cylindrical wire (λ∼0.95), suggesting that the anti-phase oscillatory motion and the geometry of the tuning prongs lead to an enhancement of the velocity of the superfluid flow.