Bi-state Superfluid H3e Weak Links and the Stability of Josephson π States
A. Marchenkov, R. W. Simmonds, S. Backhaus, A. Loshak, J. C. Davis, R. E. Packard
DOI 10.1103/PhysRevLett.83.3860 · Physical Review Letters
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Abstract
We have discovered new features of the current-phase relation, Iφ, in superfluid 3He weak links. Firstly, we find that at any given temperature there are two distinct Iφ functions that characterize the weak link. Secondly, both functions continuously develop an unusual form that ultimately leads to the previously reported π state. The observed form of Iφ has recently been predicted for unconventional quantum fluids such as 3He, high- Tc superconductors, and Bose-Einstein condensates. The two distinct states are likely to originate from the textural degree of freedom in superfluid 3He.
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