TITLE

Magnetotransport and magnetic properties of La[sub 0.7]MnO[sub 3-δ] and Pr[sub 0.65]Ba[sub 0.05]Ca[sub 0.3]MnO[sub 3-δ] superlattices

AUTHOR(S)
Pietambaram, Srinivas V.; Kumar, D.; Singh, Rajiv K.; Lee, Clinton B.
PUB. DATE
January 2001
SOURCE
Applied Physics Letters;1/8/2001, Vol. 78 Issue 2, p243
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Superlattice structures consisting of La[sub 0.7]MnO[sub 3-δ] (LMO) and Pr[sub 0.65]Ba[sub 0.05]Ca[sub 0.3]MnO[sub 3-δ] (PBCMO) systems, in which the thickness of La[sub 0.7]MnO[sub 3-δ] is fixed and that of Pr[sub 0.65]Ba[sub 0.05]Ca[sub 0.3]MnO[sub 3-δ] varied from 1 to 8 unit cells, have been grown in situ on (100) LaAlO[sub 3] substrates using a pulsed-laser deposition technique. Microstructural characterization carried out on these films shows the presence of characteristic intense satellite peaks, indicating the chemical modulation of the superlattice structure. The insulator-to-metal transition and the magnetoresistance (MR) ratio are found to vary with the number of unit cells. The samples with 1, 2, 5, and 8 unit cells of Pr[sub 0.65]Ba[sub 0.05]Ca[sub 0.3]MnO[sub 3-δ] show transition temperatures of 240, 230, 150, and 160 K and MR ratios of 540%, 592%, 3150%, and 2875%, respectively. We have observed an enhancement of magnetoresistance ratios in the case of superlattices with a thickness of PBCMO greater than 5 unit cells, which may be attributed to a ferromagnetic biasing provided by the LMO layers acting as a ferromagnetic film below its transition temperature. © 2001 American Institute of Physics.
ACCESSION #
4710455

 

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