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Title: Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide

Abstract

We report for the first time the magnetic structure of the high entropy oxide (Mg 0.2Co 0.2Ni 0.2Cu 0.2Zn 0.2)O using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by direct current and alternating current magnetic susceptibility, neutron diffraction, and spectroscopy. The magnetic propagation wavevector is k = (1/2, 1/2, 1/2) based on the cubic structure $$Fm\bar{3m}$$, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Neutron spectroscopy reveals strong magnetic excitations at 100 K that survive up to room temperature. Furthermore this work demonstrates that entropy-stabilized oxides represent a unique platform to study long-range magnetic order with an extreme chemical disorder.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1513391
Alternate Identifier(s):
OSTI ID: 1529267
Grant/Contract Number:  
AC05-00OR22725; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Name: Chemistry of Materials; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Junjie, Yan, Jiaqiang, Calder, Stuart A., Zheng, Qiang, McGuire, Michael A., Abernathy, Douglas L., Ren, Yang, Lapidus, Saul H., Page, Katharine L., Zheng, Hong, Freeland, John W., Budai, John D., and Hermann, Raphael P. Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide. United States: N. p., 2019. Web. doi:10.1021/acs.chemmater.9b00624.
Zhang, Junjie, Yan, Jiaqiang, Calder, Stuart A., Zheng, Qiang, McGuire, Michael A., Abernathy, Douglas L., Ren, Yang, Lapidus, Saul H., Page, Katharine L., Zheng, Hong, Freeland, John W., Budai, John D., & Hermann, Raphael P. Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide. United States. doi:10.1021/acs.chemmater.9b00624.
Zhang, Junjie, Yan, Jiaqiang, Calder, Stuart A., Zheng, Qiang, McGuire, Michael A., Abernathy, Douglas L., Ren, Yang, Lapidus, Saul H., Page, Katharine L., Zheng, Hong, Freeland, John W., Budai, John D., and Hermann, Raphael P. Fri . "Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide". United States. doi:10.1021/acs.chemmater.9b00624.
@article{osti_1513391,
title = {Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide},
author = {Zhang, Junjie and Yan, Jiaqiang and Calder, Stuart A. and Zheng, Qiang and McGuire, Michael A. and Abernathy, Douglas L. and Ren, Yang and Lapidus, Saul H. and Page, Katharine L. and Zheng, Hong and Freeland, John W. and Budai, John D. and Hermann, Raphael P.},
abstractNote = {We report for the first time the magnetic structure of the high entropy oxide (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by direct current and alternating current magnetic susceptibility, neutron diffraction, and spectroscopy. The magnetic propagation wavevector is k = (1/2, 1/2, 1/2) based on the cubic structure $Fm\bar{3m}$, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Neutron spectroscopy reveals strong magnetic excitations at 100 K that survive up to room temperature. Furthermore this work demonstrates that entropy-stabilized oxides represent a unique platform to study long-range magnetic order with an extreme chemical disorder.},
doi = {10.1021/acs.chemmater.9b00624},
journal = {Chemistry of Materials},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 26, 2020
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