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Systematic transport measurements have been performed on a series ofLa0.67Ca0.33MnO3 (LCMO) thin films with varying degrees of anisotropic strain.The strain is induced via epitaxial growth on NdGaO3(001) substrates and variedby controlling the thermal annealing time. An antiferromagnetic insulating(AFI) state, possibly associated with charge ordering, emerges upon thermalannealing. The Hall effect in these materials exhibits features that areindicative of a percolative phase transition and correlate closely with theemergence of the AFI state. In the paramagnetic phase, the Hall resistivitytakes on two slopes in all samples: a decreasing negative slope with increasingtemperature at low fields, which is attributed to the carrier hopping motion,and an almost temperature independent positive slope at high fields due todiffusive transport of holes. Significantly, the crossover fields of the Hallresistivity slope at different temperatures correspond to the samemagnetization, which is interpreted as the critical point of a magneticfield-driven percolative phase transition. At lower temperatures near thezero-field metal-insulator transition, pronounced enhancement of the Hallcoefficient with the development of the AFI state is observed. The enhancementpeaks near the magnetic field-driven percolation; its magnitude correlates withthe strength of the AFI state and is suppressed with the melting of the AFIstate by an in-plane magnetic field. The observations resemble many features ofthe enhancement of the Hall coefficient in granular metal films near thecomposition-driven percolation.

Signatures of electronic phase separation in the Hall effect of anisotropically strained La0.67Ca0.33MnO3 films