The Monte Carlo analysis for the magnetic response of a single-walled nanotube using Metropolis and Wang-Landau algorithms is reported in present paper. architecture used study utilizes spin half Ising model with nearest neighbors interaction obtained various orderings, namely ferromagnetic, G-type anti-ferromagnetic, A-type C-type anti-ferromagnetic. It also found that phase changes from ferro...

Abstract. A system of globally coupled rotors is studied in a unified framework of microcanonical and canonical ensembles. We consider the Fokker-Planck equation governing the time evolution of the system, and examine various stationary as well as non-stationary solutions. The canonical distribution, describing equilibrium, provides a stationary solution also in the microcanonical ensemble, whi...

In the manganite Nd0.5Ca0.5MnO3, charge ordering occurs at much higher temperature than the antiferromagnetic order (TCO = 250K, TN = 160K). the magnetic behavior of the phase TN < T < TCO is puzzling: its magnetization and susceptibility are typical of an antiferromagnet while no magnetic order is detected by neutron diffraction.We have undertaken an extensive study of the cristallographic, el...