Volume 79, Number 6, September 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 August 2007|
Low-temperature magnetotransport properties in granular ferromagnetic manganites
ECMP Division, Saha Institute of Nuclear Physics - 1/AF, Bidhannagar, Kolkata 700 064, India
Corresponding author: firstname.lastname@example.org
Accepted: 23 July 2007
The magnetotransport properties at low temperature in La0.67Sr0.33MnO3 nanoparticles, La0.67Sr0.33MnO3/Al2O3 nanocomposites and ferromagnetic-manganite thick films have been studied. All the samples exhibit low-temperature upturn in resistivity and enhanced low-field magnetoresistance of varying magnitude below the resistivity minima. The voltage dependence of conductance at low temperature for all the samples can be described by a universal scaling function , where the scaling parameter V0 is sensitive to the magnetic field. The observed magnetotransport properties are explained in a unified treatment incorporating both inter-grain tunneling conduction and thermal activation over the inter-grain potential barrier lowered by the electric field.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 72.25.-b – Spin polarized transport / 75.47.Lx – Manganites
© Europhysics Letters Association, 2007
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