Abstract
The effective-field theory with correlations based on the probability distribution technique has been used to investigate the phase diagrams (critical and compensation temperatures) of a transverse antiferromagnetic spin-\(\frac{1}{2}\) Ising cubic nanowire with diluted surface shell. It is found that the phase diagrams of the system are strongly affected by the surface shell parameters. Indeed, two compensation points appear for certain values of Hamiltonian parameters, and the range of appearance of these latter points depends strongly on the surface shell transverse field.
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Acknowledgments
This work has been initiated with the support of URAC: 08, the project RS:02(CNRST) and the Swedish Research Links programme dnr-348-2011-7264 and completed during a visit of A. A. at the Max Planck Institut für Physik Komplexer Systeme Dresden, Germany. The authors would like to thank all the organizations.
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Appendices
Appendix 1: Equations of the core and surface shell magnetizations
Within the framework of the effective field theory with correlations, the longitudinal magnetizations of the core, namely \(m_{{c}_{1}}^{z},\,m_{{c}_{2}}^{z}\) and \(m_{{c}_{3}}^{z}\), and the longitudinal magnetizations of the surface shell, namely \(m_{{s}_{1}}^{z},\,m_{{s}_{2}}^{z}\) and \(m_{{s}_{3}}^{z} \), can be obtained as:
Magnetization of the central spin \(c_{1}\):
Magnetization of the central spin \(c_{2}\):
Magnetization of the central spin \(c_{3}\):
Magnetization of the central spin \(s_{1}\):
Magnetization of the surface spin \(s_{2}\):
Magnetization of the surface spin \(s_{3}\):
Appendix 2
The coefficients A(i,j) of the matrix M are given by
where \(N_{1}=1,\,N_{2}=2,\,N_{3}=3,\,N_{4}=4\) and \(N_{6}=6\) denote, respectively, the coordination number, and \(C_{k}^{l}\) are the binomial coefficients \(C_{k}^{l}=\frac{l!}{k!(l-k)!}\).
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El Hamri, M., Bouhou, S., Essaoudi, I. et al. Phase diagrams of a transverse cubic nanowire with diluted surface shell. Appl. Phys. A 122, 202 (2016). https://doi.org/10.1007/s00339-016-9680-z
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DOI: https://doi.org/10.1007/s00339-016-9680-z