Tuning of dielectric properties of SrTiO3 in the terahertz range

被引：25

作者：

Skoromets, V. ^{[1
]}

Kadlec, F. ^{[1
]}

Kadlec, C. ^{[1
]}

Nemec, H. ^{[1
]}

Rychetsky, I. ^{[1
]}

Panaitov, G. ^{[2
]}

Mueller, V. ^{[3
]}

Fattakhova-Rohlfing, D. ^{[3
]}

Moch, P. ^{[4
]}

Kuzel, P. ^{[1
]}

机构：

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

[2] Forschungszentrum Julich, Inst Bio & Nanosyst, D-52425 Julich, Germany

[3] Univ Munich LMU, Dept Chem & Biochem, D-81377 Munich, Germany

[4] Univ Paris 13, LSPM, CNRS, UPR 3407, F-93430 Villetaneuse, France

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 17期

关键词：

STRONTIUM-TITANATE; RAMAN SCATTERING; SPECTROSCOPY;

D O I：

10.1103/PhysRevB.84.174121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：10

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