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CoAl2O4 spinel with magnetic Co2+ ions on the diamond A-lattice is known tobe magnetically frustrated. We compare neutron single crystal diffractionpatterns measured in zero and applied magnetic fields with the ones obtainedfrom classical Monte-Carlo models. In simulations we test the influence ofvarious parameters on diffraction patterns: the ratio of nearest-, J1, andnext-nearest, J2, neighbor interactions, magnetic field applied along theprincipal crystallographic directions, and random disorder on the A(Co2+)- andB(Al3+)- sites. We conclude that the models considered so far explain thebroadening of magnetic Bragg peaks in zero magnetic field and their anisotropicresponse to applied magnetic field only partly. As bulk properties of oursingle crystal are isotropic, we suggest that its microstructure, specifically<111>-twin boundaries, could be a reason of the nonconventional magnetic orderin CoAl2O4.

physical review. b, condensed matter and materials physics

Nonconventional magnetic order in frustrated diamond lattice  antiferromagnet CoAl2O4 studied by neutron diffraction and classical  Monte-Carlo simulation