Critical and compensation behaviors of an Ising mixed spin-(5/2,3/2) on a nanographene layer.

We have applied Monte Carlo simulation to study the magnetic behavior of a mixed spins S=±5/2,±3/2,±1/2<inline-graphic></inline-graphic> and σ=±3/2,±1/2<inline-graphic></inline-graphic> Ising system of a nanographene layer, where the spins S alternate with the spins σ<inline-graphic></inline-graphic> in two interpenetrating sublattices <italic>A</italic> and <italic>B</italic>, respectively. The Hamiltonian of the system contains an exchange interaction between nearest neighbors, a longitudinal magnetic field <italic>h</italic>, and a four-spin interaction J4<inline-graphic></inline-graphic>. The antiferromagnetic and the ferromagnetic exchange interactions have been investigated. Interesting phenomena have been found. In particular, the system can exhibit a compensation temperature in the presence of <italic>h</italic> and J4<inline-graphic></inline-graphic>. [ABSTRACT FROM AUTHOR]