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Title: Nd ordering, cluster formation, and the origin of negative magnetization in NdMn 0.8Fe 0.2O 3+δ

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=0.2 and x=0.25. We have explored 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 Nd 3+ ions possess zero field ordered moments of 1.6 μ B per ion at 1.5 K oriented parallel to the Mn moments. Due to 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 results are consistent with a magnetic domain/cluster model for the negative magnetization in NdMn 0.8Fe 0.2O 3+δ.

Authors:
 [1];  [2];  [3];  [4];  [1];  [3];  [5];  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Brazilian Center for Research in Energy and Materials, Campinas, SP (Brazil)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  5. Slovak Academy of Sciences (SAS), Kosice (Slovakia)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Sao Paulo Research Foundation (FAPESP); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); National Institute of Standards and Technology (NIST)
OSTI Identifier:
1570440
Alternate Identifier(s):
OSTI ID: 1570913
Grant/Contract Number:  
AC02-06CH11357; DMR-1508249; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 497; Journal Issue: C; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., and Mihalik, M. Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ. United States: N. p., 2019. Web. doi:10.1016/j.jmmm.2019.165968.
Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., & Mihalik, M. Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ. United States. doi:10.1016/j.jmmm.2019.165968.
Pajerowski, D. M., Escanhoela, C. A., Haskel, D., Prisk, T. R., Frontzek, M. D., Phelan, D., Mihalik, M., and Mihalik, M. Wed . "Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ". United States. doi:10.1016/j.jmmm.2019.165968.
@article{osti_1570440,
title = {Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+δ},
author = {Pajerowski, D. M. and Escanhoela, C. A. and Haskel, D. and Prisk, T. R. and Frontzek, M. D. and Phelan, D. and Mihalik, M. and Mihalik, M.},
abstractNote = {The orthorhombic pseudo-perovskite series NdMn1-xFexO3+δ 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 explored 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 L2 edges, neutron powder diffraction, and powder inelastic neutron scattering. We find that Nd3+ ions possess zero field ordered moments of 1.6 μB per ion at 1.5 K oriented parallel to the Mn moments. Due to 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 results are consistent with a magnetic domain/cluster model for the negative magnetization in NdMn0.8Fe0.2O3+δ.},
doi = {10.1016/j.jmmm.2019.165968},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 497,
place = {United States},
year = {2019},
month = {10}
}

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This content will become publicly available on October 9, 2020
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