Thermodynamics properties of copper-oxide superconductors described by an Ising frustrated model

Igor T. Padilha, J. Ricardo de Sousa, Minos A. Neto, Octavio R. Salmon and J.R. Viana

Physica A: Statistical Mechanics and its Applications, 2013, vol. 392, issue 20, 4897-4904

Abstract: In this work we will study the thermodynamics properties of the quenched decorated Ising model with competitive interactions through the effective field theory (EFT) of a one-spin cluster. This model is used here to describe the thermodynamics properties of the cooper-based oxide superconductors compounds in its insulating phase (antiferromagnetic). The model consists of planes in which the nodal spins interact antiferromagnetically (JA<0) with their nearest-neighbors and ferromagnetically (JF>0) with the spins that decorated the bonds, which are quenched randomly distributed over the two-dimensional lattice. The planes interact antiferromagnetically with weak exchange interaction (i.e., JA′=λJA, λ=10−5). By using the framework of an effective-field theory, based on the differential operator technique, we discuss beyond thermodynamics properties the antiferromagnetic-phase stability limit in the temperature-decorated bond concentration space (T×p), for λ=10−5 and various values of frustration parameter (α=JA/JF), magnetic field (H) and concentration parameter (p). For certain range of the parameter α we observe a reentrant behavior in low-temperature that it reflects in the properties behavior itself.

Keywords: Cooper-oxide superconductors; Ising frustrated model; Decorated model; Decoration–iteration transformation (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:392:y:2013:i:20:p:4897-4904

DOI: 10.1016/j.physa.2013.06.044

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