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Magnetization process in the classical Heisenberg model on the Shastry-Sutherland lattice

2009; American Physical Society; Volume: 79; Issue: 14 Linguagem: Inglês

10.1103/physrevb.79.144401

1550-235X

M. Moliner, D. C. Cabra, A. Honecker, Pierre Pujol, F. Stauffer,

Quantum many-body systems

We investigate classical Heisenberg spins on the Shastry-Sutherland lattice and under an external magnetic field. A detailed study is carried out both analytically and numerically by means of classical Monte Carlo simulations. Magnetization pseudoplateaus are observed around 1/3 of the saturation magnetization for a range of values of the magnetic couplings. We show that the existence of the pseudoplateaus is due to an entropic selection of a particular collinear state. A phase diagram that shows the domains of existence of those pseudoplateaus in the $(h,T)$ plane is obtained.