Abstract
Using the effective field theory with correlations, the effects of the exchange interaction on the thermal behaviors of the total magnetization, internal energy, specific heat, entropy, and free energy of a transverse antiferromagnetic Ising nanocube are investigated. The phase diagram is also calculated and discussed in detail.
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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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Appendix: Equations of the Core and Surface Shell Magnetizations
Appendix: Equations of the Core and Surface Shell Magnetizations
Within the framework of the effective field theory with correlations, four longitudinal magnetizations on the core, namely \(m_{c_{1}}^{z}\), \( m_{c_{2}}^{z}\), \(m_{c_{3}}^{z}\), and \(m_{c_{4}}^{z}\), and six longitudinal magnetizations on the surface shell, namely \(m_{s_{1}}^{z}\), \(m_{s_{2}}^{z}\) , \(m_{s_{3}}^{z}\), \(m_{s_{4}}^{z}\), \(m_{s_{5}}^{z}\) and \(m_{s_{6}}^{z}\), 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 c 4:
Magnetization of the surface spin s 1:
Magnetization of the surface spin s 2:
Magnetization of the surface spin s 3:
Magnetization of the surface spin s 4:
Magnetization of the surface spin s 5:
Magnetization of the surface spin s 6:
With 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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Hamri, M.E., Bouhou, S., Essaoudi, I. et al. Thermodynamic Properties of the Core/Shell Antiferromagnetic Ising Nanocube. J Supercond Nov Magn 28, 3127–3133 (2015). https://doi.org/10.1007/s10948-015-3143-1
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DOI: https://doi.org/10.1007/s10948-015-3143-1