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Department of Dielectrics

Institute of Physics of the Czech Academy of Sciences


group Dielectric and IR spectroscopy science Dielectric and IR spectroscopy group THz and pump-probe science THz science and technology group Photon and neutron scattering group Light and neutron scattering group Theory Theory and
simulations
group Solid materials science Solid-state materials science group Liquid crystal material science Liquid crystals

About us

Main activities of Department of Dielectrics cover experimental and theoretical investigations of high-permittivity insulators like liquid crystals, ferroelectrics, multiferroics, piezoelectrics, semiconductor nanostructures, and low-loss materials.

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Photo of people of Dielectrics
Our mission: Understanding the materials for which the frequency dependence of dielectric function can be probed by capacitance, waveguide or optical techniques. Experimental research in the Department of Dielectrics is mostly based on dielectric, infrared, time-domain THz, Raman and neutron spectroscopy, but also calorimetry, nonlinear optics and scanning probe microscopy measurements. The information on the core research activities organized within our six principal research groups can be accessed through the following links:

The most significant fresh scientific results of our deparment are listed in the section Highlights.

Oncoming seminars & workshops
workshop workshop
16.-20.6.2019, Prague, Czech Republic


Latest highlights
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Domain wall contribution to lattice dynamics and permittivity of BiFeO3

Ferroelectric materials are known for their exceptionally high dielectric permittivity. It turns out, that important part of it originates from a material's complicated microstructure and in particular from interfaces between ferroelectric domains.

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Fast polarization mechanisms in uniaxial tungsten-bronze SBN-81

The high-frequency dielectric response of the uniaxial strontium barium niobate (SrxBa1−xNb2O6) crystals with 81% of Sr (x = 0.81) was studied from 1 kHz to 30 THz along the polar axis in a wide temperature interval [E. Buixaderas et al, Sci. Rep. 7, 18034 (2017)]. Relaxor properties were observed in the complex dielectric response and four main excitations were ascertained below the phonon frequencies. These fast polarization mechanisms take place at THz, GHz and MHz ranges and show different temperature evolution.

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New type of dimers composed of bent-core molecules connected through their central cores

Structurally new type of dimers composed of bent-core molecules connected through their central cores has been prepared and studied. The switching behaviour in the applied electric field is reported.

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Infrared, terahertz and microwave spectroscopy of the soft and central modes in PMN

Analysis of IR and THz spectra using Bruggeman effective medium approach revealed that the mesoscopic structure of Pb(Mg1/3Nb2/3)O3 (PMN) consists of randomly oriented uniaxially anisotropic polar nanodomains with harder transverse optical polar modes in the direction along the local dipoles.

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Latest key articles

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M. Paściak, T. R. Welberry, J. Kulda, S. Leoni, and J. Hlinka,

Dynamic Displacement Disorder of Cubic BaTiO3

Phys. Rev. Lett. 120, 167601 (2018).
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V. Kocsis, K. Penc, T. Rõõm, U. Nagel, J. Vít, J. Romhányi, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, and S. Bordács,

Identification of Antiferromagnetic Domains Via the Optical Magnetoelectric Effect

Phys. Rev. Lett. 121, 057601 (2018).
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K. Li, X. L. Zhu, X. Q. Liu, X. Ma, M. S. Fu, J. Kroupa, S. Kamba, and X. M. Chen,

Electric-field-induced phase transition and pinched P-E hysteresis loops in Pb-free ferroelectrics with a tungsten bronze structure

NPG Asia Mater. 10, 71 (2018).
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I.Rychetský and A. Klíč,

Permittivity of polycrystal: Laminar structure

J. Eur. Ceram. Soc. 38, 3020 (2018).
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Š. Svirskas, V.V. Shvartsman, M. Dunce, R. Ignatans, E. Birks, T. Ostapchuk, S. Kamba, D.C. Lupascu, and J. Banys,

Two-phase dielectric polar structures in 0.1NBT-0.6ST-0.3PT solid solution

Acta Mater. 153, 117 (2018).
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J. Vít, F. Kadlec, C. Kadlec, F. Borodavka, Y.S. Chai, K. Zhai, Y. Sun and S. Kamba,

Electromagnon in the Y-type hexaferrite BaSrCoZnFe11AlO22

Phys. Rev. B 97, 134406 (2018).
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T. Ostatnický, V. Pushkarev, H. Němec, and P. Kužel,

Quantum theory of terahertz conductivity of semiconductor nanostructures

Phys. Rev. B 97, 085426 (2018).
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M. Retuerto, S. Skiadopoulou, F. Borodavka, C. Kadlec, F. Kadlec, J. Prokleška, Z. Deng, J. A. Alonso, M. T. Fernandez-Diaz, F. O. Saouma, J. I. Jang, D. Legut, S. Kamba, and M. Greenblatt,

Structural and spectroscopic properties of the polar antiferromagnet Ni2MnTeO6

Phys. Rev. B 97, 144418 (2018).
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M. Šindler, C. Kadlec, P. Kužel, K. Ilin, M. Siegel, and H. Němec,

Departure from BCS response in photoexcited superconducting NbN films observed by terahertz spectroscopy

Phys. Rev. B 97, 054507 (2018).
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M. Savinov, V. Bovtun, E. Tereshina-Chitrova, A. Stupakov, A. Dejneka, and M. Tyunina,

Dielectric relaxation in epitaxial films of paraelectric-magnetic SrTiO3-SrMnO3 solid solution

Appl. Phys. Lett. 112, 052901 (2018).
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V. Stepkova and J. Hlinka,

Pinning of a ferroelectric Bloch wall at a paraelectric layer

Beilstein J. Nanotechnol. 9, 2356 (2018).
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M. Tabatabaee, M. Poupon, V. Eigner, P. Vaněk, and M. Dušek,

The role of hydrogen bonds in order-disorder transition of a new incommensurate low temperature phase β-[Zn-(C7H4NO4)2]•3H2O

Z. Kristallogr. 233, 17 (2018).
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A. Bubnov, C. Vacek, M. Czerwiński, T. Vojtylová, W. Piecek, and V. Hamplová,

Design of polar self-assembling lactic acid derivatives with the keto group possessing sub-micrometre helical pitch

Beilstein J. Nanotechnol. 9, 333 (2018).
Last update: 5 December 2019 (admin)