Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics
Abstract
A physical understanding of the nature of spatially modulated phases (SMPs) in rare-earth-doped antiferrodistortive (AFD) multiferroics and how they behave close to surfaces and interfaces is lacking. Here the emergence of the antiferroelectric (AFE), ferroelectric (FE), or ferrielectric (AFE-FE) spatial modulation in the vicinity of the morphotropic phase transition in ( ) is explored on the atomic level using high-resolution scanning transmission electron microscopy (HRSTEM). The suppression, or “melting,” of the AFE-type SMP in the vicinity of the AFD twin wall/surface junction is revealed by HRSTEM in films and explained by the hybrid approach combining Landau-Ginzburg-Devonshire (LGD) phenomenology and the semimicroscopic four-sublattice model (FSM). The LGD-FSM approach reduces the problem of AFE (or AFE-FE) SMP emergence and stability to the thermodynamic analysis of the free-energy functional with AFE, FE, and AFD long-range order parameters and two master parameters: the FE-AFE coupling strength between four neighboring A sites and the nonstoichiometry factor, which are proportional to the variations of La concentration in films. Finally, we establish that the surface-induced melting of SMPs and the associated broadening of AFE AFD domain walls minimize the film free energy under certain conditions imposed on the master parameters and gradient energy below the critical value. The observed behavior provides insight into the origin of SMPs in AFD multiferroics.
- Authors:
-
- National Academy of Sciences of Ukraine, Kyiv (Ukraine). Inst. of Physics; Taras Shevchenko Kyiv National Univ. (Ukraine)
- National Academy of Sciences of Ukraine, Kyiv (Ukraine). Inst. of Physics
- South China Normal Univ., Guangzhou (China). Inst. for Advanced Materials, Guangdong Provincial Key Lab. of Optical Information Materials and Technology
- Taras Shevchenko Kyiv National Univ. (Ukraine)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); European Research Council (ERC)
- OSTI Identifier:
- 1842639
- Grant/Contract Number:
- AC05-00OR22725; U1832104; 11704130; 778070; 2017B030301007; 201906010016
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 7; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electric polarization; ferroelectric domains; structural order parameter; thin films; finite-element method
Citation Formats
Morozovska, Anna N., Eliseev, Eugene A., Chen, Deyang, Shvetz, Vladislav, Nelson, Christopher T., and Kalinin, Sergei V. Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.075426.
Morozovska, Anna N., Eliseev, Eugene A., Chen, Deyang, Shvetz, Vladislav, Nelson, Christopher T., & Kalinin, Sergei V. Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics. United States. https://doi.org/10.1103/physrevb.102.075426
Morozovska, Anna N., Eliseev, Eugene A., Chen, Deyang, Shvetz, Vladislav, Nelson, Christopher T., and Kalinin, Sergei V. Wed .
"Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics". United States. https://doi.org/10.1103/physrevb.102.075426. https://www.osti.gov/servlets/purl/1842639.
@article{osti_1842639,
title = {Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics},
author = {Morozovska, Anna N. and Eliseev, Eugene A. and Chen, Deyang and Shvetz, Vladislav and Nelson, Christopher T. and Kalinin, Sergei V.},
abstractNote = {A physical understanding of the nature of spatially modulated phases (SMPs) in rare-earth-doped antiferrodistortive (AFD) multiferroics and how they behave close to surfaces and interfaces is lacking. Here the emergence of the antiferroelectric (AFE), ferroelectric (FE), or ferrielectric (AFE-FE) spatial modulation in the vicinity of the morphotropic phase transition in LaxBi1–xFeO3 (x~0.2) is explored on the atomic level using high-resolution scanning transmission electron microscopy (HRSTEM). The suppression, or “melting,” of the AFE-type SMP in the vicinity of the AFD twin wall/surface junction is revealed by HRSTEM in La0.22Bi0.78FeO3 films and explained by the hybrid approach combining Landau-Ginzburg-Devonshire (LGD) phenomenology and the semimicroscopic four-sublattice model (FSM). The LGD-FSM approach reduces the problem of AFE (or AFE-FE) SMP emergence and stability to the thermodynamic analysis of the free-energy functional with AFE, FE, and AFD long-range order parameters and two master parameters: the FE-AFE coupling strength between four neighboring A sites and the nonstoichiometry factor, which are proportional to the variations of La concentration in LaxBi1–xFeO3 films. Finally, we establish that the surface-induced melting of SMPs and the associated broadening of AFE AFD domain walls minimize the film free energy under certain conditions imposed on the master parameters and gradient energy below the critical value. The observed behavior provides insight into the origin of SMPs in AFD multiferroics.},
doi = {10.1103/physrevb.102.075426},
journal = {Physical Review B},
number = 7,
volume = 102,
place = {United States},
year = {Wed Aug 12 00:00:00 EDT 2020},
month = {Wed Aug 12 00:00:00 EDT 2020}
}
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