Magnetic structure of a multiferroic compound: CuOCl.

The CuOCl compound has been shown to be a high-temperature spin-driven multiferroic system, with a linear magneto-electric coupling. In this paper we propose a complete study of its magnetic structure. We derive the low energy magnetic Hamiltonian using multi-reference configuration interaction and the spin structure using Monte-Carlo simulations.

Why the pyrochlore-like antiferromagnet NaCuFis magnetically non-frustrated.

We present a theoretical study of the magnetic properties for the pyrochlore-like NaCuFcompound, which surprisingly experience little or no frustration. The magnetic effective exchange interactions were calculated usingmethods explicitly treating the electronic correlation. A model Hamiltonian (quantum Heisenberg Hamiltonian, and for comparison a spin 1/2 Ising Hamiltonian) was built from these interactions and used to determine the zero temperature magnetic order versus magnetic field.