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This content will become publicly available on May 18, 2019

Title: Interface reconstruction with emerging charge ordering in hexagonal manganite

Multiferroic materials, which simultaneously have multiple orderings, hold promise for use in the next generation of memory devices. We report a novel self-assembled MnO double layer forming at the interface between a multiferroic YMnO 3 film and a c-Al 2O 3 substrate. The crystal structures and the valence states of this MnO double layer were studied by atomically resolved scanning transmission electron microscopy and spectroscopy, as well as density functional theory (DFT) calculations. A new type of charge ordering has been identified within this MnO layer, which also contributes to a polarization along the [001] direction. DFT calculations further establish the occurrence of multiple couplings between charge and lattice in this novel double layer, in addition to the polarization in nearby YMnO 3 single layer. The interface reconstruction reported here creates a new playground for emergent physics, such as giant ferroelectricity and strong magnetoelectric coupling, in manganite systems.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [3] ; ORCiD logo [3] ;  [3] ; ORCiD logo [5] ;  [6] ; ORCiD logo [4] ; ORCiD logo [3]
  1. Tsinghua Univ., Beijing (China). School of Materials Science and Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
  2. Univ. of Arkansas, Fayetteville, AR (United States). Physics Dept. and Inst. for Nanoscience and Engineering; Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics and Collaborative Innovation Center of Quantum Matter, Dept. of Physics
  3. Tsinghua Univ., Beijing (China). School of Materials Science and Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
  5. Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics and Collaborative Innovation Center of Quantum Matter, Dept. of Physics
  6. Univ. of Arkansas, Fayetteville, AR (United States). Physics Dept. and Inst. for Nanoscience and Engineering
Publication Date:
Report Number(s):
BNL-207873-2018-JAAM
Journal ID: ISSN 2375-2548
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 4; Journal Issue: 5; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1462404