Coexistence of the Phonon and Relaxation Soft Modes in the Terahertz Dielectric Response of Tetragonal BaTiO3

被引：196

作者：

Hlinka, J. ^{[1
]}

Ostapchuk, T. ^{[1
]}

Nuzhnyy, D. ^{[1
]}

Petzelt, J. ^{[1
]}

Kuzel, P. ^{[1
]}

Kadlec, C. ^{[1
]}

Vanek, P. ^{[1
]}

Ponomareva, I. ^{[2
]}

Bellaiche, L. ^{[2
]}

机构：

[1] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic

[2] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.101.167402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dielectric response to infrared waves polarized along the tetragonal axis of a ferroelectric single-domain crystal of BaTiO3 was determined by time-domain THz spectroscopy and Fourier-transform infrared reflectivity techniques. In addition to the three well-known polar lattice modes, the experiment shows an additional mode of the relaxation type in the THz spectral region, which accounts for the Curie-Weiss behavior of the c-axis dielectric constant. A comparison of experimental results with ab initio based effective-Hamiltonian simulations allows us to elucidate its relation to the order-disorder model of Comes, Lambert, and Guinier [Solid State Commun. 6, 715 (1968)].

引用

页数：4

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