Thermal and magnetic properties of a nanotube with spin- 1/2 core and spin- 3/2 shell structure

• Surface shell and core magnetization of mixed spin- 1/2 and spin- 3/2 Ising nanotube is studied by EFT with correlations.
• This is the first investigation on mixed spin- 1/2 and spin- 3/2 Ising nanotube.
• The effects of crystal field on the system are investigated as well.
• Both first-order and second-order phase transitions and critical end point are observed.
• Magnetic susceptibilities, specific heat, internal energy and free energy of the system have also been studied in detail.

The magnetic properties of a cylindrical Ising nanotube with a spin- 1/2 core surrounded by a spin- 3/2 shell system have been studied by means of the effective field theory (EFT). We have investigated the effects of crystal-field coupling at the surface shell and bilinear interactions among the core and surface shells to the order parameters, susceptibility, internal energy, specific heat, and free energy. Some characteristic phenomena are examined in terms of thermal or crystal-field variations when the other system parameters are fixed. Moreover, we have observed first-order and second-order transitions and critical end points in the (D/J, kT/J) plane, where D/J and kT/J are crystal-field and temperature, respectively.