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Transport properties and colossal magnetoresistance in epitaxial La0.67Cd0.33MnO3 thin film

Hegde, MS and Vasanthacharya, NY and Subramanyam, SV and Sahana, M and Prasad, V and UNSPECIFIED (1997) Transport properties and colossal magnetoresistance in epitaxial La0.67Cd0.33MnO3 thin film. In: Applied Physics Letters, 71 (18). pp. 2701-2703.

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An optimal composition of La0.67Cd0.33MnO3 was synthesized by ceramic route. The compound crystallized in a rhombohedral structure with lattice parameters a = 5.473(4) Å and α = 60°37′. Resistivity measurement showed an insulator-to-metal transition coupled with a ferromagnetic transition of around 255 K. Epitaxial thin films were fabricated on the LaAlO3 (100) substrate by a pulsed laser deposition technique. The psuedocubic lattice parameter a of the film is 3.873(4) Å. The insulator-to-metal transition of the film was observed at 250 K which is comparable with the bulk value. The film was ferromagnetic below this temperature. Magnetoresistance defined as ΔR/R0 = (RH−R0)/R0 was over −86% near the insulator-to-metal transition temperature of 240 K at 6 T magnetic field and over-30% at relatively low fields of 1 T. No magnetoresistance was observed at low temperatures in the film unlike in the polycrystalline sample, where about a 40% decrease in resistance was observed on applying 6 T magnetic field due to the spin dependent scattering at the grain boundaries.

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
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: 23 Dec 2011 07:08
Last Modified: 23 Dec 2011 07:08
URI: http://eprints.iisc.ac.in/id/eprint/42864

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