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Theory of the pi state in 3He Josephson junctions | | J.K. Viljas
; E.V. Thuneberg
; | | Date: |
13 Jul 1999 | | Journal: | Phys. Rev. Lett. 83, 3868 (1999) | | Subject: | cond-mat | | Abstract: | The flow of superfluid 3He-B through a 65 x 65 array of nanometer size apertures has been measured recently by Backhaus et al. They find in the current--phase relation a new branch, so-called pi state. We study two limiting cases which show that the pi state arises from coupling of the phase degree of freedom to the spin-orbit rotation. The pi state exists in a single large aperture, but is difficult to observe because of hysteresis. A better correspondence with experiments is obtained by assuming a thin wall, where the Josephson coupling between the two sides arises from a dense array of pin-holes. | | Source: | arXiv, cond-mat/9907181 | | Services: | Forum | Review | PDF | Favorites | |
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