Observation of domain-wall superlattice states in a frustrated triangular array of Josephson junctions
Abstract
A family of ground states at frustrations f=1/2-(1/2)N-1, with N an integer >=2, has been observed in the superfluid response of a triangular Josephson junction array as a function of the magnetic flux (~f) threading a unit cell. These states can be constructed by introducing one- or two-dimensional superlattices of domain walls on the background of the checkerboard ground state at f=1/2, the 1D superlattice (striped phase) being energetically more favorable for N>3. A structural change of the ground state from the striped phase to a 2D superlattice of vacancies is predicted at fc~=0.468.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1994
- DOI:
- 10.1103/PhysRevLett.72.562
- Bibcode:
- 1994PhRvL..72..562T
- Keywords:
-
- 74.50.+r;
- 75.10.Hk;
- Tunneling phenomena;
- point contacts weak links Josephson effects;
- Classical spin models