Tuning of dielectric properties of SrTiO.sub.3./sub. in the terahertz range

0369878 - FZÚ 2012 RIV US eng J - Journal Article
Skoromets, Volodymyr - Kadlec, Filip - Kadlec, Christelle - Němec, Hynek - Rychetský, Ivan - Panaitov, G. - Müller, V. - Fattakhova-Rohlfing, D. - Moch, P. - Kužel, Petr
Tuning of dielectric properties of SrTiO₃ in the terahertz range.
Physical Review. B. Roč. 84, č. 17 (2011), "174121-1"-"174121-10". ISSN 1098-0121
R&D Projects: GA ČR GD202/09/H041; GA AV ČR(CZ) IAA100100907; GA ČR GA202/09/0430
Institutional research plan: CEZ:AV0Z10100520
Keywords : strontium titanate * terahertz spectroscopy * anharmonic coefficient
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.691, year: 2011
http://link.aps.org/doi/10.1103/PhysRevB.84.174121

Tuning of the dielectric permittivity spectra of strontium titanate (SrTiO3) single crystals in an external electric field is investigated between 90 and 300 K by means of terahertz time-domain spectroscopy. Application of the electric bias leads to an appreciable tuning of the permittivity observed up to room temperature both in the parallel and perpendicular directions to the bias field. The observed behavior is interpreted in terms of soft-mode hardening due to the anharmonic character of its potential. No additional low-frequency relaxation mode was observed. A weak temperature dependence of the anharmonic coefficients was found in agreement with previously published low-temperature data.
Permanent Link: http://hdl.handle.net/11104/0203840