title: Colossal piezoresistance in phase separated manganites.
abstract: We have measured the strain dependent transport properties of phase separated manganite thin films. We subjected (La(1-y)Pr(y))(1-x)Ca(x)MnO(3) thin films grown on NdGaO(3)(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 condition for CPR. The maximum CPR is observed only when the phase boundaries are free to move in the fluid-like phase separated state. Our results show that both long-range strain interactions and quenched disorder play an important role in micrometer scale phase separation in manganites, albeit in different temperature ranges.
authors.affiliation: Department of Physics, University of Florida, Gainesville, FL 32611, USA.
authors.forename: Jacob
authors.initials: J
authors.lastname: Tosado
authors.forename: Tara
authors.initials: T
authors.lastname: Dhakal
authors.forename: Amlan
authors.initials: A
authors.lastname: Biswas