Abstract
We have measured the strain dependent transport properties of phase separated manganite thin films. Wesubjected (La1−yPry)1−xCaxMnO3 thinfilms grown on NdGaO3(110) substrates to direct external mechanical stress using a three-point beam bending method.The resultant change in resistance reveals a colossal piezoresistance (CPR) in manganites.Our experiments reveal that phase separation is a necessary but not sufficient conditionfor CPR. The maximum CPR is observed only when the phase boundaries arefree to move in the fluid-like phase separated state. Our results show that bothlong-range strain interactions and quenched disorder play an important role inmicrometer scale phase separation in manganites, albeit in different temperature ranges.
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