A numerical study of planar arrays of correlated spin islands

Ilaria Maccari, Andrea Maiorano (), Enzo Marinari and Juan Jesus Ruiz-Lorenzo
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Ilaria Maccari: Dipartimento di Fisica, Sapienza Università di Roma
Andrea Maiorano: Dipartimento di Fisica, Sapienza Università di Roma
Enzo Marinari: Dipartimento di Fisica, IPCF-CNR and INFN, Sapienza Università di Roma
Juan Jesus Ruiz-Lorenzo: Instituto de Biocomputación y Física de Sistemas Complejos (BIFI)

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 5, 1-6

Abstract: Abstract We analyze a system of interacting islands of XY spins on a triangular lattice. This model has been introduced a few years ago by Eley et al. [Nat. Phys. 8, 59 (2012)] to account for the phenomenology in experiments on tunable arrays of proximity coupled long superconductor-normal metal-superconductor junctions. The main features of the model are the separation of a local and a global interaction energy scale and the mesoscopic character of the spin islands. Upon lowering the temperature the model undergoes two crossovers corresponding to an increasing phase coherence on a single island and to the onset of global coherence across the array; the latter is a thermodynamical phase transition in the Ising universality class. The dependence of the second transition on the island edge-to-edge spacing is related to the proximity-effect of the coupling constant.

Keywords: Statistical; and; Nonlinear; Physics (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70171-x

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