Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide

doi:10.1021/acs.chemmater.9b00624

This content will become publicly available on April 26, 2020

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

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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:

^[1];

^[2]; Lapidus, Saul H. ^[2];

^[1]; Zheng, Hong ^[2]; Freeland, John W. ^[2];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: 2019-04-26

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.

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                    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.

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                    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.

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@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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DOI: 10.1021/acs.chemmater.9b00624

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