Current-processinginduced anisotropic conduction in manganite filmsY. W. Xie, J. R. Sun, D. J. Wang, S. Liang, Y. Z. Chen, W. M. Lü and B. G. Shen
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences - Beijing 100080, PRC
received 11 March 2007; accepted in final form 7 June 2007; published July 2007
published online 3 July 2007
Current-processinginduced anisotropic conduction (CIAC) has been observed recently in La1-xCaxMnO3 (x = 0.2, 0.33) films. Here we report a more applicable and simple method, applying processing current at room temperature, to produce such anisotropic conduction. Using this method, we have examined La1-xCaxMnO3 (x = 0.2, 0.33), La0.67Sr0.33MnO3, Pr0.7Ca0.3MnO3, La0.35Pr0.32Ca0.33MnO3 and La0.7Ce0.3MnO3 films grown on SrTiO3 substrates, and found CIAC in all these films, showing CIAC is a fairly universal phenomenon for manganites. The method exhibits good ability to process samples of large resistance/size. We even got remarkable anisotropic conduction in a manganite film as long as 3 mm. Our effort provides a very simple method to prepare such samples, which will help to further researches in this field.
75.47.Lx - Manganites.
75.47.Gk - Colossal magnetoresistance.
73.40.Ei - Rectification.
© Europhysics Letters Association 2007