Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.167402
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Funding
- MSMT [ME08109, LC-512]
- GACR [202/06/P219]
- ASCR [AVOZ10100520]
- NSF [DMR-0701558, DMR-0404335, DMR-0080054]
- ONR [N00014-04-1-0413, N00014-08-1-0915]
- DOE [DE-FG02-05ER46188]
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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)].
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