The size effect on transport properties of colossal magnetoresistance materials La0.67Ca0.33MnO3

High quality La0.67Ca0.33MnO3 (LCMO) film was deposited via a novel pulsed electron deposition technique on SrTiO3(100) single crystal substrate. The micro-bridge with different widths was fabricated by using electron beam lithography (EBL) technique and their transport properties were studied. For the micro-bridges with width of 2 and 1.5 mu m, the insulator-to-metal transition temperature (T (P)) keeps unchanged compared with the film. For the micro-bridges with width of 1 mu m, the T (P) shifts towards the lower temperature by 50 K. When the width decreases down to 500 nm, the insulator-to-metal transition disappears. The magnetoresistance behavior of these micro-bridges was studied, and the results show that the low field magnetoresistance (LFMR) decreases and the high field magnetoresistances (HFMR) keep almost unchanged as the width of micro-bridge is reduced.Physics, MultidisciplinarySCI(E)EI2ARTICLE3251-2575