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  Feyerherm, R.; Loose, A.; Rabu, P.; Drillon, M.: Neutron diffraction studies of canted antiferromagnetic ordering in Co^II hydroxide terephtalate. Solid State Sciences 5 (2003), p. 321-326

10.1016/S1293-2558(03)00014-1

Abstract:
The ordered magnetic structure of fully deuterated Co(II) hydroxy terephthalate Co2(OD)2(tp-d4) (tp-d4 = C8D4O4) (1) has been determined at various temperatures by neutron powder diffraction analysis. The layered nuclear structure is in agreement with that found from X-Ray powder diffraction data and the hydrogen atoms (D) were located in the crystallographic cell. Below the ordering temperature, T_C = 48 K, the magnetic diffraction patterns reveal the existence of different magnetic moments on two non-equivalent Co(II) ions forming ferrimagnetic layers. Zero-field cooled experiments show that the long range magnetic order is basically antiferromagnetic along the stacking axis, with possible weak canting within the layers. In field-cooled experiments, strongly canted antiferromagnetism is observed with a resulting ferromagnetic component of 1.8 mu_B along the b axis on one of the Co sites. It is shown that this phase is metastable, the weakly canted phase being the ground state at very low temperature.