Magnetic properties of the mixed hexagonal nanowire system with half and integer spins: Monte Carlo simulation and mean field approximation study

Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

“…In summary, we do not observe either first or secondorder phase transition at a finite temperature, such as predicted in references [7,8,18]. Instead, we just observed the vestiges of zero-temperature phase transition between F I and F M phases at finite temperature.…”

“…On the other hand, comparing with the "critical" temperature obtained from MFA [8,18], which is depicted as a dashed line in fig. 9, we observe that, effectively, at sufficiently low temperature below T ≈ 0.15, the meanfield result looks the same as T p .…”

“…Recently, the magnetic properties of cylindrical nanowires have shown great potential applications such as magnetic recording, shift registers and logic gates, among other possible candidates. Indeed, over the last decades, several researches have been devoted to examine the magnetic and thermodynamic properties of nanowire systems, both experimentally [1][2][3][4][5][6] and theoretically [7][8][9][10][11][12][13][14][15][16][17][18].…”

“…From the theoretical point of view, several techniques have been used, such as mean-field approximation (MFA) [8,18], effective field theory (EFT) [7,13,14], Monte Carlo simulation (MC) [18][19][20], among others [21,22]. Special attention has been given to the study of mixed spin systems, in particular those composed by spin-1 and spin-1/2 particles arranged in hexagonal structures [7,8,14,15,18]. These works have predicted the occurrence of first and second order phase transitions as well as spontaneous magnetization at finite temperature.…”

“…Precisely, we investigate rigorously a mixed hexagonal Ising type nanowire system, composed by spin-1/2 particles in the core and spin-1 particles in the shell, previously considered in references [7,8,18], see fig. 1.…”