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|Title:||Solution sol–gel processing and investigation of percolation threshold in La2/3Ca1/3MnO3:xSiO2 nanocomposite|
Percolation (Solid State)
|Citation:||Journal of Magnetism and Magnetic Materials 238(2-3), 178-184|
|Abstract:||The composites of La2/3Ca1/3MnO3:xSiO2 (0less-than-or-equals, slantxless-than-or-equals, slant0.40) have been synthesized by sol–gel technique to derive homogeneous nanocomposites. Si4+ by virtue of its strong preference for tetrahedral site does not enter the perovskite lattice. The percolation threshold composition has been determined by resistivity measurements at around 90% volume fraction of LCMO. A detailed electrical, magnetic and magneto-transport characterizations have been carried out for composites around the threshold composition (x=0.05,0.10,0.15). The magnetoresistance results at 1 T show a sharp peak at Tc and a minimum just below Tc as reported in several polycrystalline LCMO composites.|
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