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Polycrystalline La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ (LSMO) thin films weresynthesized by pulsed laser ablation on single crystal (100) yttria-stabilizedzirconia (YSZ) substrates to investigate the mechanism of magneto-transport ina granular manganite. Different degrees of granularity is achieved by using thedeposition temperature (T$_{D}$) of 700 and 800 $^{0}$C. Although nosignificant change in magnetic order temperature (T$_C$) and saturationmagnetization is seen for these two types of films, the temperature andmagnetic field dependence of their resistivity ($\rho$(T, H)) is strikinglydissimilar. While the $\rho$(T,H) of the 800 $^{0}$C film is comparable to thatof epitaxial samples, the lower growth temperature leads to a material whichundergoes insulator-to-metal transition at a temperature (T$_{P}$ $\approx$ 170K) much lower than T$_C$. At T $\ll$ T$_P$, the resistivity is characterized bya minimum followed by ln $\emph{T}$ divergence at still lower temperatures. Thehigh negative magnetoresistance ($\approx$ 20$%$) and ln $\emph{T}$ dependencebelow the minimum are explained on the basis of Kondo-type scattering fromblocked Mn-spins in the intergranular material. Further, a striking feature ofthe T$_D$ = 700 $^{0}$C film is its two orders of magnitude larger anisotropicmagnetoresistance (AMR) as compared to the AMR of epitaxial films. We attributeit to unquenching of the orbital angular momentum of 3d electrons of Mn ions inthe intergranular region where crystal field is poorly defined.

Magnetotransport in polycrystalline La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ thin films of controlled granularity