Bi-state superfluid He-3 weak links and the stability of Josephson pi states

Citation
A. Marchenkov et al., Bi-state superfluid He-3 weak links and the stability of Josephson pi states, PHYS REV L, 83(19), 1999, pp. 3860-3863
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
19
Year of publication
1999
Pages
3860 - 3863
Database
ISI
SICI code
0031-9007(19991108)83:19<3860:BSHWLA>2.0.ZU;2-Q
Abstract
We have discovered new features of the current-phase relation, I(phi), in s uperfluid He-3 weak links. Firstly, we find that at any given temperature t here are two distinct I(phi) functions that characterize the weak link. Sec ondly, both functions continuously develop an unusual form that ultimately leads to the previously reported pi state. The observed form of I(phi) has recently been predicted for unconventional quantum fluids such as He-3, hig h-T-c superconductors, and Bose-Einstein condensates. The two distinct stat es are likely to originate from the textural degree of freedom in superflui d He-3.