Charge order textures induced by non-linear couplings in a half-doped manganite

Ismail El Baggari; David J. Baek; Michael J. Zachman; Di Lu; Yasuyuki Hikita; Harold Y. Hwang; Elizabeth A. Nowadnick; Lena F. Kourkoutis

doi:10.1038/s41467-021-24026-7

Charge order textures induced by non-linear couplings in a half-doped manganite

Ismail El Baggari, David J. Baek, Michael J. Zachman, Di Lu, Yasuyuki Hikita, Harold Y. Hwang, Elizabeth A. Nowadnick, Lena F. Kourkoutis

Materials MicroAnalysis

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy (cryo-STEM) enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd_1/2Sr_1/2MnO₃. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and that cryo-STEM can reveal local order in strongly correlated systems at the atomic scale.

Original language	English
Article number	3747
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-24026-7
State	Published - Dec 1 2021

Funding

acknowledges support from the University of California, Merced and the use of computational resources supported by the Cornell University Center for Advanced Computing. The work at Stanford was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences, and Engineering, under contract no. DE-AC02-76SF00515. This work was primarily supported by the Department of Defense Air Force Office of Scientific Research (FA 9550-16-1-0305). I.E.B. and L.F.K. acknowledge partial support by the National Sciences Foundation through the PARADIM Materials Innovation Platform (DMR-1539918). This work made use of the Cornell Center for Materials Research facilities supported through the NSF MRSEC program (DMR-1719875). The FEI Titan Themis 300 was acquired through NSF-MRI-1429155, with additional support from Cornell University, the Weill Institute, and the Kavli Institute at Cornell. E.A.N.

Funders	Funder number
Cornell University Center for Advanced Computing
Department of Defense Air Force Office of Scientific Research
Division of Materials Sciences
National Sciences Foundation
National Science Foundation	DMR-1539918, NSF-MRI-1429155
U.S. Department of Defense	FA 9550-16-1-0305
U.S. Department of Energy	DE-AC02-76SF00515
University of California
Society for the Humanities, Cornell University
Basic Energy Sciences
College of Veterinary Medicine, Cornell University
Institute for the Social Sciences, Cornell University
Center for Advanced Human Resource Studies, Cornell University
Cornell University
Center on the Microenvironment and Metastasis, Cornell University
College of Agriculture and Life Sciences, Cornell University
University of California Merced
David R. Atkinson Center for a Sustainable Future , Cornell University
Materials Research Science and Engineering Center, Harvard University	DMR-1719875
College of Arts and Sciences, Cornell University
New York State Water Resources Institute, Cornell University
Northeastern Integrated Pest Management Center, Cornell University

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10.1038/s41467-021-24026-7

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abstract = "The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy (cryo-STEM) enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd1/2Sr1/2MnO3. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and that cryo-STEM can reveal local order in strongly correlated systems at the atomic scale.",

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AU - Hikita, Yasuyuki

AU - Hwang, Harold Y.

AU - Nowadnick, Elizabeth A.

AU - Kourkoutis, Lena F.

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Charge order textures induced by non-linear couplings in a half-doped manganite

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