Phase transitions in a kagomé lattice of Josephson junctions
M. S. Rzchowski
DOI 10.1103/PhysRevB.55.11745 · Physical Review B
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Abstract
We observe a phase transition at 0.076 of the coupling energy in a fully frustrated kagomé lattice of Josephson junctions (XY kagomé antiferromagnet) using Monte Carlo methods. The jump in the superfluid density at the transition temperature retains its universal Kosterlitz-Thouless value despite the thermodynamic degeneracy of the low-temperature phase. We find these observations to be consistent with an unbinding transition involving vortex-antivortex pairs with 1/3 the normal phase gradient. We also observe an unusual sequence of five field-dependent ground states consisting of currents of equal magnitude circulating around each elementary triangle in the structure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrCr8-xGr4-xO19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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