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RESEARCH PRODUCT
Impact of granularity on transport properties of mechanically stressed La0.67Ca0.33MnO3 films
Yu. A. BoikovYu. A. BoikovDonats ErtsTord Claesonsubject
Materials scienceMagnetoresistanceMechanical EngineeringAnalytical chemistryMineralogyGiant magnetoresistanceCondensed Matter PhysicsManganitePulsed laser depositionCrystallinityLattice constantMechanics of MaterialsElectrical resistivity and conductivityGeneral Materials ScienceThin filmdescription
Abstract (La,Ca)MnO 3 is one of so called collosal magnetoresistive materials and it is of interest to correlate its transport properties to film growth in order to optimize its performance. Two-hundred nanometers thick (100)La 0.67 Ca 0.33 MnO 3 films were grown by laser ablation on (100)SrTiO 3 , (100)LaAlO 3 and (100)(LaAlO 3 ) 0.3 +(Sr 2 AlTaO 6 ) 0.7 substrates. The films were granular in structure with low angle boundaries between the grains. The volume of the unit cell was considerably smaller for films grown on a SrTiO 3 substrate than on LaAlO 3 . At temperatures higher than the one where the spins order, the strongest response of resistivity on temperature ρ ( T ) was measured for those (100)La 0.67 Ca 0.33 MnO 3 films that had the smallest volume of the unit cell. An increase of the lattice parameter for a film was accompanied by a decrease of the resistivity. The films grown on (LaAlO 3 ) 0.3 +(Sr 2 AlTaO 6 ) 0.7 substrates had the best crystallinity and the largest magnetoresistance.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-01-01 | Materials Science and Engineering: B |