期刊
PHYSICAL REVIEW B
卷 81, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.064105
关键词
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资金
- ONR [N00014-04-1-0413, N00014-08-1-0915]
- NSF [DMR-0080054 (C-SPIN), DMR-0701558, DMR-0404335]
- DOE [DE-SC0002220]
- U.S. Department of Energy (DOE) [DE-SC0002220] Funding Source: U.S. Department of Energy (DOE)
- EPSCoR
- Office Of The Director [0918970] Funding Source: National Science Foundation
The thickness dependency of the Curie temperature in stress-free Pb(Zr(0.5)Ti(0.5))O(3) ultrathin films under open-circuit conditions is revealed from the computation of some nontrivial statistical quantities (such as fourth-order cumulants), via a first-principles-based technique. For thicknesses above 16 angstrom, this dependency follows the usual finite-size scaling law with a critical exponent that is consistent with the one associated with the three-dimensional-random-Ising universality class. On the other hand, the Curie temperature-versus-film's thickness curve deviates from this scaling law below 12 angstrom while being rather well described by an empirical equation down to 8 angstrom.
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