Infrared, terahertz, and microwave spectroscopy of the soft and central modes in Pb(Mg.sub.1/3./sub.Nb.sub.2/3./sub.)O.sub.3./sub.

0483352 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Nuzhnyy, Dmitry - Petzelt, Jan - Bovtun, Viktor - Kempa, Martin - Kamba, Stanislav - Hlinka, Jiří - Hehlen, B.
Infrared, terahertz, and microwave spectroscopy of the soft and central modes in Pb(Mg_1/3Nb_2/3)O₃.
Physical Review B. Roč. 96, č. 17 (2017), s. 1-13, č. článku 174113. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA MŠMT(CZ) LD15014; GA ČR GA15-04121S
Institucionální podpora: RVO:68378271
Klíčová slova: relaxor ferroelectrics * soft mode * polar nanodomains
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.813, rok: 2017

From the infrared reflectivity and time-domain terahertz spectra combined with available high-frequency dielectric data above the megahertz range in a broad temperature range of 10 to 900 K, a full picture of the soft- and central-mode behavior in the classical relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 is suggested.The response perpendicular to the local dipole moment, at high temperatures induced by random fields, undergoes a classical softening from high temperatures with permittivity obeying the Curie-Weiss law, ε=C/(T - TC), with TC=380 K, whereas the response parallel to it shows no softening.

Trvalý link: http://hdl.handle.net/11104/0278701