Magnetic phases in Mn1-xFexWO4 studied by neutron powder diffraction
Hahn-Meitner Institut, Abteilung SF3, Glienicker Strasse 100, 14109 Berlin, Germany
2 Institut für Physik, EKM, Universität Augsburg, 86159 Augsburg, Germany
Corresponding author: a firstname.lastname@example.org
Published online: 14 March 2003
The magnetic structures of Mn1-xFexWO4 with x = 0.0, 0.16, 0.21, 0.225, 0.232, 0.24, 0.27, 0.29, and 1.0 were refined from neutron powder diffraction data. The magnetic phase diagram could be completed in the coexistence range of different magnetic structures up to x = 0.29. For the magnetic state at 1.5 K a commensurate antiferromagnetic structure with a propagation vector was found for while the magnetic spins order with for . In the latter phase, additionally, weak magnetic reflections indexed to an incommensurate ordering with occur in the diffraction pattern up to x = 0.29 indicating the occurence of a reentrant phase. For the low temperature phases are separated from a magnetic high temperature phase showing only magnetic reflections indexed to a spin arrangement with . The magnetic phase diagram is discussed qualitatively considering random superexchange between the statistically distributed Mn2+- and Fe2+-ions in the coexistence range of different magnetic structures related to those of pure MnWO4 and FeWO4.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 61.12.Ld – Neutron diffraction
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003