Electrical resistivity and enhanced magnetoresistance in (La0.6Pb0.4MnO3/La0.85MnO3-δ)n superlattices

Sahana, M. ; Hegde, M. S. ; Prasad, V. ; Subramanyam, S. V. (1999) Electrical resistivity and enhanced magnetoresistance in (La0.6Pb0.4MnO3/La0.85MnO3-δ)n superlattices Journal of Applied Physics, 85 (2). pp. 1058-1062. ISSN 0021-8979

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Official URL: http://jap.aip.org/resource/1/japiau/v85/i2/p1058_...

Related URL: http://dx.doi.org/10.1063/1.369228


Resistivity and magnetoresistance studies have been carried out on (La0.6Pb0.4 MnO3/La0.85MnO3-δ)n (n=30 periods) ferromagnetic/ paramagnetic oxide multilayers fabricated by pulsed laser deposition. An epitaxial film of La0.6 Pb0.4MnO3 is ferromagnetic and metallic below 320 K, whereas that of La0.85MnO3-δ is a paramagnetic (and antiferromagnetic at low temperatures) insulator. The multilayers showed an insulator-to-metal transition at 285±5 K. The magnetoresistances of these multilayers were about 60%-75% at the transition temperature in 6 T magnetic field. The magnetoresistance is also shown to be dependent on the thickness of the ferromagnetic oxide layer. A maximum magnetoresistance of 75% was observed for a [La0.6Pb0.4 MnO3(50Å)/La0.85MnO3-δ(20Å)]30 superlattice as against 25% in a single La0.6Pb0.4MnO3 film at 285 K.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Lanthanum Compounds; Lead Compounds; Superlattices; Magnetic Multilayers; Electrical Resistivity; Metal-insulator Transition; Pulsed Laser Deposition; Magnetic Epitaxial Layers; Magnetic Susceptibility; Magnetoresistance; Magnetic Transitions
ID Code:51428
Deposited On:28 Jul 2011 11:41
Last Modified:11 Jul 2012 04:22

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