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Phase Transition in Mixed Spin Ising Nanoparticles

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Abstract

The phase transitions of two mixed-spin (1/2,1) Ising nanoparticles with n = 4.0 and n = 6.0 are investigated by using the effective-field theory with correlations (EFT). The spin-1 atom with a single-ion anisotropy is decorated at the center of regular n-polygon (or nanoparticle with a value of n) and the spin-1/2 n atoms are put at the perimeter n sites. The phase transition in the nanoparticle with n = 6.0 is rather different from that in the nanoparticle with n = 4.0. It is shown that the number of n plays just like the coordination number z in the bulk mixed-spin Ising systems: the hexagonal nanoparticle with n = 6.0 has exhibited the first-order transition and the tricritical behavior, although the tetragonal nanoparticle with n = 3.0 did not show such behaviors, depending on the values of exchange interactions.

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  1. Nagoya University, 1-510, Kurosawadai, Midoriku, Nagoya, 458-0003, Japan

    T. Kaneyoshi

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Kaneyoshi, T. Phase Transition in Mixed Spin Ising Nanoparticles. J Supercond Nov Magn 33, 1151–1157 (2020). https://doi.org/10.1007/s10948-019-05324-0

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