Backhaus S, Pereverzev SV, Loshak A, Davis JC, Packard RE
Physics Department, University of California, Berkeley, CA 94720, USA.
Science. 1997 Nov 21;278(5342):1435-8. doi: 10.1126/science.278.5342.1435.
Direct measurements of the current-phase relation, I versus Deltaphi, for a weak link coupling two reservoirs of B-phase superfluid helium-3 (3He-B) were made over a wide range of temperatures. The weak link consists of a square array of 100-nanometer-diameter apertures. For temperatures T such that T/Tc >/= 0.6 (where Tc is the superfluid transition temperature), I approximately sin(Deltaphi). At lower temperatures, I(Deltaphi) approaches a straight line. Several remarkable phenomena heretofore inaccessible to superconducting Josephson junctions, including direct observation of quantum oscillations and continuous knowledge of Deltaphi, were also observed.
在很宽的温度范围内，对连接两个B相超流氦-3（³He-B）库的弱连接进行了电流-相位关系I与Δφ的直接测量。该弱连接由直径为100纳米的孔的方形阵列组成。对于温度T满足T/Tc≥0.6（其中Tc是超流转变温度）的情况，I近似为sin(Δφ)。在较低温度下，I(Δφ)趋近于一条直线。还观察到了超导约瑟夫森结迄今无法实现的几个显著现象，包括量子振荡的直接观测以及对Δφ的连续了解。
