Terahertz and far infrared response of Ba.sub.x./sub.Sr.sub.1-x./sub.TiO.sub.3./sub. films

0353071 - FZÚ 2011 RIV GB eng J - Článek v odborném periodiku
Simon, Elizabeth - Ostapchuk, Tetyana - Kužel, Petr - Hlinka, Jiří - Kamba, Stanislav - Nguema, E. - Mounaix, P. - Carru, J.C. - Velu, G.
Terahertz and far infrared response of Ba_xSr_1-xTiO₃ films.
Phase Transitions. Roč. 83, 10-11 (2010), s. 966-973. ISSN 0141-1594. E-ISSN 1029-0338
Grant CEP: GA ČR GAP204/10/0616; GA MŠMT ME08109
Výzkumný záměr: CEZ:AV0Z10100520
Klíčová slova: thin films * complex dielectric function * time-domain terahertz spectroscopy * infrared transmittance
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.006, rok: 2010

Here we report on experimental study of terahertz and far infrared dielectric response of polycrystalline BaxSr1-x TiO3 (x = 0.5, 0.7 and 0.8) films of 0.3-1 µm thicknesses deposited on a sapphire. Terahertz and infrared transmission measurements were performed in 100-420 K temperature range covering the vicinity of TC of their bulk prototypes. We identified all polar optical phonons observed in bulk samples below 400 cm-1 of the same composition including soft and central mode and found some additional features, which we assigned to the depolarizing field effect coming from the structural inhomogeneity and unreleased strain.
Trvalý link: http://hdl.handle.net/11104/0192415