Probing Andreev reflection in superfluid 3He-B using a quartz tuning fork

被引：19

作者：

Bradley, D. I. ^{[2
]}

Clovecko, M. ^{[1
]}

Gazo, E. ^{[1
]}

Skyba, P. ^{[1
]}

机构：

[1] Safarik Univ, Inst Expt Phys SAS, Ctr Low Temp Phys, Kosice 04001, Slovakia

[2] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2008年 / 152卷 / 5-6期

基金：

英国工程与自然科学研究理事会;

关键词：

superfluid (3)He-B; Andreev reflection; tuning fork;

D O I：

10.1007/s10909-008-9815-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Direct measurements of the Andreev reflection of the quasiparticles excitations in superfluid (3)He-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 ratio Delta(0)/kT(c) to 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 constant lambda characterizing the velocity field profile. This value for a tuning fork was estimated to be 1.28, different from that for cylindrical wire (lambda similar to 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.

引用

页码：147 / 155

页数：9

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