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    Topologically Allowed Nonsixfold Vortices in a Sixfold Multiferroic Material: Observation and Classification

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    Type
    Article
    Authors
    Cheng, Shaobo
    Li, Jun
    Han, Myung-Geun
    Deng, Shiqing
    Tan, Guotai
    Zhang, Xixiang cc
    Zhu, Jing
    Zhu, Yimei
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    CRF-2015-2549-CRG4
    Date
    2017-04-05
    Permanent link to this record
    http://hdl.handle.net/10754/623280
    
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    Abstract
    We report structural transformation of sixfold vortex domains into two-, four-, and eightfold vortices via a different type of topological defect in hexagonal manganites. Combining high-resolution electron microscopy and Landau-theory-based numerical simulations, we investigate the remarkable atomic arrangement and the intertwined relationship between the vortex structures and the topological defects. The roles of their displacement field, formation temperature, and nucleation sites are revealed. All conceivable vortices in the system are topologically classified using homotopy group theory, and their origins are identified.
    Citation
    Cheng S, Li J, Han M-G, Deng S, Tan G, et al. (2017) Topologically Allowed Nonsixfold Vortices in a Sixfold Multiferroic Material: Observation and Classification. Physical Review Letters 118. Available: http://dx.doi.org/10.1103/physrevlett.118.145501.
    Sponsors
    The electronic microscopy work was carried out at Brookhaven National Laboratory and supported by the U.S. DOE Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-SC0012704. J. Z., S.C., and S. D. would like to acknowledge the financial support by Chinese National Natural Science Foundation under Project No. 51390471 and the National 973 Project of China (Project No. 2015CB654902) as well as the support of S. C. for studying abroad from China Scholarship Council. The samples were prepared through the use of the resources of the National Center for Electron Microscopy in Beijing. The theoretic work was done at King Abdullah University of Science and Technology (KAUST) and supported by KAUST Office of Sponsored Research under Grant No. CRF-2015-2549-CRG4.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review Letters
    DOI
    10.1103/physrevlett.118.145501
    Additional Links
    https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.145501
    ae974a485f413a2113503eed53cd6c53
    10.1103/physrevlett.118.145501
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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