Interplay between static and dynamic polar correlations in relaxor Pb(Mg1/3Nb2/3)O3

被引：56
作者：
Stock, C. [1 ]
Van Eijck, L. [2 ]
Fouquet, P. [2 ]
Maccarini, M. [2 ]
Gehring, P. M. [3 ]
Xu, Guangyong [4 ]
Luo, H. [5 ]
Zhao, X. [5 ]
Li, J. -F. [6 ]
Viehland, D. [6 ]
机构：
[1] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[2] Inst Laue Langevin, F-38042 Grenoble 9, France
[3] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[4] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA
[5] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201800, Peoples R China
[6] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 14期
关键词：
SINGLE-CRYSTALS; FERROELECTRIC PBMG1/3NB2/3O3; NEUTRON-SCATTERING; DIFFUSE-SCATTERING; PHASE-TRANSITIONS; CENTRAL-PEAK; BEHAVIOR; SOFT; MODE;
D O I：
10.1103/PhysRevB.81.144127
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have characterized the dynamics of the polar nanoregions in Pb(Mg1/3Nb2/3)O-3 through high-resolution neutron-backscattering and spin-echo measurements of the diffuse-scattering cross section. We find that the diffuse-scattering intensity consists of both static and dynamic components. The static component first appears at the Curie temperature Theta similar to 400 K while the dynamic component freezes completely at the temperature T-f similar to 200 K; together, these components account for all of the observed spectral weight contributing to the diffuse-scattering cross section. The integrated intensity of the dynamic component peaks near the temperature at which the frequency-dependent dielectric constant reaches a maximum (T-max) when measured at 1 GHz, i.e., on a time scale of similar to 1 ns. Our neutron-scattering results can thus be directly related to dielectric and infrared measurements of the polar nanoregions. Finally, the global temperature dependence of the diffuse scattering can be understood in terms of just two temperature scales, which is consistent with random-field models.
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页数：7
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