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

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2008-03, Vol.51 (3), p.251-257
• Main Authors: Li, PeiGang, Lei, Ming, Guo, YanFeng, Guo, Xi, Chen, LeiMing, Tang, WeiHua, Song, PengYun, Chen, JinPing
• Format: Article
• Language: English
• Subjects: Astronomy; Classical and Continuum Physics; Colossal magnetoresistance; Electron beam lithography; Low temperature; Magnetic properties; Magnetoresistivity; Observations and Techniques; Physics; Physics and Astronomy; Single crystals; Size effects; Substrates; Transition temperature; Transition temperatures; Transport properties
• ISSN: 1672-1799; 1674-7348; 1862-2844; 1869-1927
• DOI: 10.1007/s11433-008-0023-8

High quality La 0.67 Ca 0.33 MnO 3 (LCMO) film was deposited via a novel pulsed electron deposition technique on SrTiO 3 (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 μm, the insulator-to-metal transition temperature ( T P ) keeps unchanged compared with the film. For the micro-bridges with width of 1 μm, 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.