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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+delta

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Author(s):
Pajerowski, D. M. [1] ; Escanhoela, Jr., C. A. [2, 3] ; Haskel, D. [2] ; Prisk, T. R. [4] ; Frontzek, M. D. [1] ; Phelan, D. [5] ; Mihalik, Jr., M. [6] ; Mihalik, M. [6]
Total Authors: 8
Affiliation:
[1] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 - USA
[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA
[3] Brazilian Ctr Res Energy & Mat, Brazilian Synchrotron Light Lab, BR-13083970 Campinas, SP - Brazil
[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 - USA
[5] Argonne Natl Lab, Mat Sci Div, Argonne, IL 60439 - USA
[6] SAS, Inst Expt Phys, Watsonova 47, Kosice - Slovakia
Total Affiliations: 6
Document type: Journal article
Source: Journal of Magnetism and Magnetic Materials; v. 497, MAR 1 2020.
Web of Science Citations: 0
Abstract

The orthorhombic pseudo-perovskite series NdMn1-xFexO3+delta has negative magnetization, i.e. magnetization directed opposite to an applied field under certain conditions, for x = 0.2 and x = 0.25. We have investigated the microscopic origin of this phenomenon for x = 0.2 by using elastic and inelastic scattering techniques including neutron backscattering, X-ray magnetic circular dichroism at the Mn K and Nd L-2 edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd3+ ions possess zero field ordered moments of 1.6 mu(B) 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 are consistent with a magnetic domain/cluster model for the negative magnetization in NdMn0.8Fe0.2O3+delta. (AU)

FAPESP's process: 16/24137-3 - Orbital magnetism in double perovskite compounds under extreme conditions by synchrotron radiation techniques
Grantee:Carlos Augusto Escanhoela Júnior
Support type: Scholarships abroad - Research Internship - Post-doctor