Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K21: Emergent Properties: Synthesis and Interfacial Effects
3:00 PM–6:00 PM,
Tuesday, March 5, 2024
Room: 101A
Sponsoring
Unit:
GMAG
Chair: Jennifer Fowlie, Stanford University
Abstract: K21.00001 : Designing Magnetism in High Entropy Oxides*
3:00 PM–3:36 PM
Presenter:
Alessandro R Mazza
(Los Alamos National Laboratory)
Author:
Alessandro R Mazza
(Los Alamos National Laboratory)
This has been realized in single crystal epitaxial films of the ABO3 perovskite La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3, where considering only the first nearest neighbors 15 atomic pairs with different exchange interactions and 5 possible spin states are uniformly distributed on a cubic lattice [1]. XRD and STEM-EELS studies confirm crystallinity, epitaxy, and full site mixing of the 5 B-site elements (no single element clustering) [2]. Experimental results from neutron studies, XMCD, and SQUID magnetometry demonstrate unexpected long-range magnetic ordering arising from the highly frustrated local environment. Furthermore, we demonstrate an understanding of only the first nearest neighbor interactions allows for reliable prediction of prevailing magnetic phase and phase degeneracy both through hole doping and manipulation of choice of magnetic cations [3,4]. These results are discussed in the broader context of emerging materials – where high entropy oxides exhibit an exciting avenue in the exploration of new strongly correlated and quantum materials.
*This work was supported by the DOE Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. A portion of this work was supported by the NNSA's Laboratory Directed Research and Development Program at Los Alamos National Laboratory. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the U.S. Department of Energy's NNSA, under contract 89233218CNA000001.
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