期刊
PHYSICAL REVIEW B
卷 78, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.052103
关键词
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资金
- DOE [DEFG02-05ER46188]
- ONR [N00014-08-1-0915, N00014-04-1-0413]
- NSF [DMR-0701558, DMR-0404335, DMR-0080054]
- NSF MRI [0421099, 0722625]
- RFBR [07-02-12165-OFI, 08-02-92006NNS, 07-0200099]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [0722625] Funding Source: National Science Foundation
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [0421099] Funding Source: National Science Foundation
First-principles-based effective Hamiltonians are combined with nonequilibrium molecular dynamics to determine the electric-field-induced change in temperature in ferroelectrics. As a result, (i) the applied field can be ac in nature with a wide frequency range, (ii) bulks and nanostructures (with homogeneous or highly inhomogeneous dipolar configurations) can be investigated, and (iii) the influence of various phenomena on the electrocaloric effect can be revealed. This scheme yields an electrocaloric coefficient in excellent agreement with measurement and that strongly depends on the field-induced variation of volume in Pb(Zr1-xTix)O-3 bulks. An unusual phenomenon is also reported in dots under ac fields.
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