Reentrant Phenomena in an Antiferromagnetic Ising Nanoparticle and a Ladder-Type Ising System under an Applied Transverse Field

The phase diagrams and magnetization curves of antiferromagnetic nanoparticle and ladder-type system are investigated by using the effective-field theory with correlations. They have exhibited some characteristic features, such as the reentrant phenomena, when a finite transverse field h is applied and even when h = 0.0.