Phys. Rev. Lett. 83, 3860–3863 (1999)Bi-state Superfluid 3He Weak Links and the Stability of Josephson π StatesReceived 28 May 1999; published in the issue dated 8 November 1999 We have discovered new features of the current-phase relation, I(φ), in superfluid 3He weak links. Firstly, we find that at any given temperature there are two distinct I(φ) 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 I(φ) 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. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.3860
DOI:
10.1103/PhysRevLett.83.3860
PACS:
67.57.-z, 74.50.+r
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