Eur. Phys. J. B 47, 29-35 (2005)
https://doi.org/10.1140/epjb/e2005-00297-9

Role of A-site deficiency in the magneto-transport properties of Pr_0.7Sr_0.3MnO₃ relaxed films

¹ Institut d'Électronique Fondamentale, IEF - UMR 8622 CNRS, Bâtiment 220, Université Paris-Sud, 91405 Orsay Cedex, France
² Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, B.P. 802, Sfax, Tunisia
³ Laboratoire de Cristallographie et Sciences des Matériaux, CRISMAT, CNRS UMR 6508, ENSICAEN, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France

Corresponding author: ^a Abdel.Cheikhrouhou@fss.rnu.tn

Received: 1 October 2004
Revised: 25 February 2005
Published online: 21 September 2005

Abstract

The magneto-transport properties of thick relaxed A-site deficient films having the composition PrSr_0.3MnO₃(PSMO with the symbol for the Pr vacancy) and Pr_0.7SrMnO₃(PSMO) are studied. A direct comparison with a Pr_0.7Sr_0.3MnO₃(PSMO)completely relaxed film, deposited under the same growth conditions, shows a reduction of the in-plane parameter a₁₀₀ associated to an enhancement of the out-plane parameter. The strains (bulk strain and biaxial Jahn-Teller strain do vary with the nature of the cationic vacancy. For example, an enhancement of of 9% in the PSMO film (Sr deficient) produces a decrease of T_C of 30 K, whereas the Pr deficient PSMO film exhibits a large reduction of both %) and (divided by a factor of 5), which enhances T_C of 12 K, similarly to previous observations on bulk ceramics. With a reduced resistivity (  cm), the obtained Pr-deficient film, PSMO, exhibits the best magneto-transport properties with a decreasing magnetoresistance sensitivity at low field.