Nd Ordering, Cluster Formation, and the Origin of Negative Magnetization in NdMn0l8Fe0.2O3=δ

Published

March 1, 2020

Author(s)

D. M. Pajerowski, Jr. C. A. Escanhoela, D. Haskel, Timothy R Prisk, M. D. Frontzek, D. Phelan, Jr. Mihalik, M. Mihalik

Abstract

The orthorhombic pseudo-perovskite series NdMn_1-xFe_xO_{3+δ has negative magnetization, i.e. magnetization directed opposite to an applied field under certain conditions, for x = 0.3 and x=0.25. We have investigated the microscopic origin of this phenomenon for X = 0.2 by using a comprehensive array of elastic and inelastic scattering techniques including neutron backscattering, x-ray magnetic circular dichroism at the Mn K and Nd L6d2} edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd³⁺ ions possess zero field ordered moments of 1.6 υ^dΒ per ion at 1.5 K oriented parallel to the Mn moments. Based upon the neutron diffraction, there is a freezing of magnetic clusters before the long range order sets in. The Nd crystal field levels shift with temperature due to a molecular field that is 1.1 meV at 1.5 K. These findings help to explain the previously observed negative magnetization in this material as due to a magnetic domain effect.

Citation

Journal of Magnetism and Magnetic Materials

Volume

497

Pub Type

Journals

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Citation

Pajerowski, D. , Escanhoela, J. , Haskel, D. , Prisk, T. , Frontzek, M. , Phelan, D. , Mihalik, J. and Mihalik, M. (2020), Nd Ordering, Cluster Formation, and the Origin of Negative Magnetization in NdMn_0l8Fe_0.2O_3=δ, Journal of Magnetism and Magnetic Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926014 (Accessed March 3, 2025)