Glassy dynamics of Josephson arrays on a dice lattice
Coherentia-INFM Unità di Napoli and Dipartimento di Scienze
Fisiche Università “Federico II” - 80126 Napoli, Italy
2 NEST-INFM and Scuola Normale Superiore - I-56126 Pisa, Italy
Accepted: 25 November 2002
In this letter we study the phase diagram and the approach to the equilibrium of Josephson junction arrays on a dice lattice for two different values of the magnetic frustration (f=1/2,1/3). In both cases, the array undergoes a Berezinskii-Kosterlitz-Thouless–like phase transition. For the fully frustrated array, f=1/2, we find evidence of a glassy behavior although the system has no disorder. For comparison we study the dynamics of the array at a different value of frustration (f=1/3) and find no trace of glassy dynamics.
PACS: 64.70.Pf – Glass transitions / 73.23.-b – Electronic transport in mesoscopic systems / 74.25.Ha – Magnetic properties
© EDP Sciences, 2003