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Polarized neutron diffraction has been used to determine the manganese magnetic moments aligned by magnetic fields applied parallel to the [001] axis in the antiferromagnetic phases of Mn5Si3. It has been found that in the two antiferromagnetic phases which exist below TN the magnetic moments on the manganese sites which can be aligned by a magnetic field all have the same order of magnitude, although in the antiferromagnetic structures the ordered moments are very different. The transition, on cooling, from the AF2 to the AF1 phase is accompanied by a sharp decrease in the susceptibilities of all the sites. This uniform decrease is not consistent with disordered local moments on the sites which do not have ordered moments, but can be understood using the same criteria for stability of Mn moments as have been invoked for manganese rare-earth compounds (Ballou R, Lacroix C and Nunez Regueiro M D 1991 Phys. Rev. Lett. 66 1910). |
