Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 19, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/19/192203
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Funding
- NSF [DMR-0804452]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0804452] Funding Source: National Science Foundation
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We have measured the strain dependent transport properties of phase separated manganite thin films. We subjected (La1-yPry)(1-x)CaxMnO3 thin films 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 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.
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