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

Sahana, M and Hegde, MS and Prasad, V and Subramanyam, SV (1999) Electrical resistivity and enhanced magnetoresistance in (La0.6Pb0.4MnO3/La0.85MnO3-delta)(n) superlattices. In: Journal of Applied Physics, 85 (2). pp. 1058-1062.

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Abstract

Resistivity and magnetoresistance studies have been carried out on (La0.6Pb0.4MnO3/La0.85MnO3-delta)(n) (n = 30 periods) ferromagnetic/paramagnetic oxide multilayers fabricated by pulsed laser deposition. An epitaxial film of La0.6Pb0.4MnO3 is ferromagnetic and metallic below 320 K, whereas that of La0.85MnO3-delta 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 [La0.6Pb0.4MnO3(50 Angstrom)/La0.85MnO3-delta(20 Angstrom)](30) superlattice as against 25% in a single La0.6Pb0.4MnO3 film at 285 K. (C) 1999 American Institute of Physics. [S0021-8979(99)06902-9].

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Jun 2009 12:09
Last Modified: 19 Sep 2010 05:26
URI: http://eprints.iisc.ernet.in/id/eprint/19089

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