期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.207601
关键词
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资金
- ONR [N00014-11-1-0384, N00014-12-1-1034, N00014-08-1-0915]
- NSF [DMR-1066158]
- Department of Energy, Office of Basic Energy Sciences [ER-46612]
- ARO [W911NF-12-1-0085]
- National Natural Science Foundation of China [51272204]
- Department of Defense
- MRI from NSF [0722625]
- MRI-R2 from NSF [0959124]
- CI-TRAIN from NSF [0918970]
- Russian Foundation for Basic Research [12-08-00887-a]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [0959124] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1066158] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [0918970] Funding Source: National Science Foundation
A first-principles-based effective Hamiltonian is used to investigate low-temperature properties of Ba(Zr, Ti)O-3 relaxor ferroelectrics under an increasing dc electric field. This system progressively develops an electric polarization that is highly nonlinear with the dc field. This development leads to a maximum of the static dielectric response at a critical field, Eth, and involves four different field regimes. Each of these regimes is associated with its own behavior of polar nanoregions, such as shrinking, flipping, and elongation of dipoles or change in morphology. The clusters propagating inside the whole sample, with dipoles being parallel to the field direction, begin to form at precisely the Eth critical field. Such a result, and further analysis we perform, therefore, reveal that field-induced percolation of polar nanoregions is the driving mechanism for the transition from the relaxor to ferroelectric state.
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