Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19571
Title: Tackling Polar Response in Oxygen Deficient KTaO3 Thin Films
Author: Mota, D. A.
Romaguera-Barcelay, Y.
Tkach, A.
Perez de la Cruz, J.
Vilarinho, P. M.
Tavares, P. B.
Agostinho Moreira, J.
Almeida, A.
Keywords: STRONTIUM-TITANATE
SRTIO3
FERROELECTRICITY
DISPERSION
TANTALATE
OXIDE
RAMAN
Issue Date: 2014
Publisher: TAYLOR & FRANCIS LTD
Abstract: Oxygen deficient KTaO3 thin films were grown by RF magnetron sputtering on Si/SiO2/Ti/Pt substrates. Room temperature X-ray diffraction shows that they are under a compressive strain of 2.3%. Leakage current results reveal the presence of a conductive mechanism, following Poole-Frenkel formalism. The existence of a polar response below T-pol approximate to 367 degrees C was ascertained by dielectric, polarization, and depolarization current measurements. A Cole-Cole dipolar relaxation was evidenced which is associated with oxygen vacancies induced dipoles. After annealing the films in an oxygen atmosphere above T-pol, the aforementioned polar response is suppressed, due to significant oxygen vacancies reduction.
Peer review: yes
URI: http://hdl.handle.net/10773/19571
DOI: 10.1080/00150193.2014.893804
ISSN: 0015-0193
Publisher Version: 10.1080/00150193.2014.893804
Appears in Collections:CICECO - Artigos



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