TY - JOUR
AU - R Shreekala
AU - M Rajeswari
AU - K Ghosh
AU - A Goyal
AU - J.Y Gu
AU - C Kwon
AU - Z Trajanovic
AU - T Boettcher
AU - R.L Greene
AU - Ramamoorthy Ramesh
AU - T Venkatesan
AB - We report our study of the effect of crystallinity on the magnetoresistance in epitaxial and polycrystaliine La2/3Ba1/3MnO3 and La2/3Ca1/3MnO3 thin films. Magnetoresistance in epitaxial films exhibits field dependence and temperature dependence similar to bulk single crystals and sintered bulk ceramics. The polycrystalline films exhibit a markedly different behavior. The magnetoresistance in this case shows either a monotonic increase or saturation with decreasing temperature in contrast to that of epitaxial films in which the magnetoresistance peaks close to the ferromagnetic transition temperature. The field dependence in the polycrystalline films is also remarkably different. At low fields, we observe a sharp drop in resistance followed by a more gradual decrease at higher fields. Our data suggest that in addition to the intrinsic magnetoresistance, grain-boundary transport contributes significantly to the magnetoresistance in polycrystalline films. © 1997 American Institute of Physics.
BT - Applied Physics Letters
DO - 10.1063/1.119520
LA - eng
M1 - 2
N1 - cited By 134
N2 - We report our study of the effect of crystallinity on the magnetoresistance in epitaxial and polycrystaliine La2/3Ba1/3MnO3 and La2/3Ca1/3MnO3 thin films. Magnetoresistance in epitaxial films exhibits field dependence and temperature dependence similar to bulk single crystals and sintered bulk ceramics. The polycrystalline films exhibit a markedly different behavior. The magnetoresistance in this case shows either a monotonic increase or saturation with decreasing temperature in contrast to that of epitaxial films in which the magnetoresistance peaks close to the ferromagnetic transition temperature. The field dependence in the polycrystalline films is also remarkably different. At low fields, we observe a sharp drop in resistance followed by a more gradual decrease at higher fields. Our data suggest that in addition to the intrinsic magnetoresistance, grain-boundary transport contributes significantly to the magnetoresistance in polycrystalline films. © 1997 American Institute of Physics.
PB - American Institute of Physics Inc.
PY - 1997
SP - 282
EP - 284
T2 - Applied Physics Letters
TI - Effect of crystallinity on the magnetoresistance in perovskite manganese oxide thin films
VL - 71
SN - 00036951
ER -