International Journal of Modern Physics B %%*h »«» M o • • • « • Vol. 19, Nos. 15, 16 & 17 (2005) 2526-2531 VKp World Scientific x ' WB www.worldscientific.com © World Scientific Publishing Company MAGNETIC AND ELECTRONIC TRANSPORT PROPERTIES OF NANOSTRUCTURED Lao^CaossMnOs FILMS P. G.. LI Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, CHINA Pgli @ aphy. iphy ac. en C. P. CHEN and Y. ZHANG Department of Physics, Peking University, Beijing 100871, CHINA X.L.FU and L.M.CHEN Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, CHINA L .H. LI Department of Physics, University of Rhode Island, Rl02881, USA W. H. TANG Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, CHINA whtang @ aphy. iphy. ac. en Received 6 September 2004 Revised 8 December 2004 Nanostructured colossal magnetoresistive (CMR) films of Lao.67Cao.33Mn0 3 (LCMO) were deposited by using pulsed electron deposition technique on anodized aluminum oxide membranes with pores of 50 nm in diameter The magnetic and electronic transport properties were measured on Quantum Design physics propertiesmeasurement system (PPMS) and magnetic properties measurement system (MPMS). The resistance peak temperature (T P ) is about 165 K and the Curie temperature (T c ) is about 260 K. Large magnetoresistance was observed near T P in these nanostructured LCMO films. Linear I-V curves at different temperatures indicate no electronic tunneling effect. The large difference between T P and T c suggests that the nature of the resistance peak is different from that of bulk samples. The physics in these nanostructured films should be interesting to explore the mechanism of CMR effect. Keywords: Nanostructured; colossal magnetoresistive; magnetic and electronic transport 1. Introduction The CMR effect in mixed valence manganese perovskites Ri_ x A x Mn0 3 , where R and 2526 Int. J. Mod. Phys. B 2005.19:2526-2531. Downloaded from www.worldscientific.com by FLINDERS UNIVERSITY LIBRARY on 01/28/15. For personal use only.