# Colossal Magnetoresistance in Potassium Doped Lanthanum Manganite: A Comparative Study of Polycrystalline Solid and Thin Film

Sahana, M and Hegde, MS and Shivakumara, C and Prasad, V and Subramanyam, SV (1999) Colossal Magnetoresistance in Potassium Doped Lanthanum Manganite: A Comparative Study of Polycrystalline Solid and Thin Film. In: Journal of Solid State Chemistry, 148 (2). pp. 342-346.

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## Abstract

Electrical and magnetic properties of $La_{0.82}K_{0.08}MnO_{3-\delta}$, both in polycrystalline and thin film forms, have been examined in the temperature range 1.2 to 300 K. Near the insulator-to-metal transition temperature of 260 K, the magnetoresistance values were higher for the thin film (~70%) compared to the polycrystalline sample (~35%). No magnetoresistance was observed in the thin film at low temperature. A low field magnetoresistance of 30% was observed in the temperature range 1.2–10 K in the polycrystalline sample which can be attributed to the spin dependent scattering of conduction electrons at the grain boundaries.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 30 Oct 2006 19 Sep 2010 04:32 http://eprints.iisc.ernet.in/id/eprint/8901