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Chin. Phys., 2006, Vol. 15(4): 850-853    DOI: 10.1088/1009-1963/15/4/032
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Simultaneous observation of positive and negative giant magnetoresistances in composite (La0.83Sr0.17MnO3)1-x(ITO)x

Wang Miao, Zhang Ning
Magnetoelectronic Laboratory, Nanjing Normal University, Nanjing 210097, China
Abstract  We have studied the transport property of the composites (La0.83Sr0.17 MnO3)1-x(ITO)x [ITO=(In2O3)0.95 (SnO2)0.05], which were fabricated by mechanically mixing La0.83Sr0.17 MnO3 and ITO grains. A giant positive magnetoresistance (PMR) has been observed above the Curie temperature Tc for samples with x around 0.40, in addition to the negative magnetoresistance related to spin-dependent interfacial tunnelling below Tc. For (La0.83Sr0.17MnO3)0.6(ITO)0.4, the magnetoresistive ratio for the PMR can reach 39.3% under a magnetic field H=2.24\tm105A/m. Theoretical analysis suggests that the magnetic-field-induced broadening of the p--n barrier between both kinds of grains and the density of the p--n heterostructures should be responsible for the PMR behaviour.
Keywords:  p-n heterostructure      granular system      composite      giant magnetoresistance  
Received:  17 December 2005      Revised:  25 January 2006      Published:  20 April 2006
PACS:  75.47.De (Giant magnetoresistance)  
  61.05.cp (X-ray diffraction)  
  61.66.Fn (Inorganic compounds)  
  72.20.My (Galvanomagnetic and other magnetotransport effects)  
  72.80.Tm (Composite materials)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 20473038), the Foundation of High-Tech Project in Jiangsu province, China (Grant No BG-2005401).

Cite this article: 

Wang Miao, Zhang Ning Simultaneous observation of positive and negative giant magnetoresistances in composite (La0.83Sr0.17MnO3)1-x(ITO)x 2006 Chin. Phys. 15 850

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