Pr 0.5 Ca 0.5 MnO 3 thin films deposited on LiNbO 3 substrates

• Author(s): Gomes, I. Tarroso ; Almeida, B. G. ; Araújo, J. P.
• Date: 2013
• Persistent ID: http://hdl.handle.net/1822/27363
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Praseodimium calcium manganite; Laser ablation; Structural properties; Electrical properties
• Document Type: Article
• Language: English

Description

Thin films of Pr 0.5 Ca 0.5 MnO 3 have been deposited on z-cut LiNbO 3 by pulsed laser ablation. The X-ray diffraction measurements showed that the films have grown highly oriented on LiNbO 3 , with a pseudocubic (111) preferred growth direction. The thicknesses of the films, measured by low angle X-ray reflectivity, are between 13 and 140 nm. Their electrical resistivity present a semiconducting-like behaviour with an anomaly around 240 K, that corresponds to the charge ordering transition. The temperature of the transition (T_CO) was estimated from ln(r) vs. (1/T) plots. The charge ordering temperature was found to be dependent on the strain induced by the lattice mismatch on the films.