Magnetotransport and magnetic properties of La0.7MnO3-δ and Pr0.65Ba0.05Ca0.3MnO3-δ superlattices

S. V. Pietambaram, D. Kumar, R. K. Singh, C. B. Lee

Research output: Contribution to journalConference articlepeer-review


In an effort to achieve high magnetoresistance ratios at high temperature and low field, we have fabricated superlattice structures consisting of La0.7MnO3-δ (LMO) and Pr0.65Ba0.05Ca0.3MnO3-δ (PBCMO) systems where La0.7MnO3-δ is believed to act as a ferromagnetic biasing source to Pr0.65Ba0.05Ca0.3MnO3-δ. LMO and PBCMO individually transform to ferromagnetic states at 240 K and 60 K respectively. A series of samples, in which the thickness of La0.7MnO3-δ is fixed and that of Pr0.65Ba0.05Ca0.3MnO3-δ varied from 1 to 8 unit cells, have been grown in situ on (100) LaAlO3 substrates using a pulsed laser deposition technique. Microstructural characterization carried out on these films show the presence of characteristic intense satellite peaks indicating the chemical modulation of the superlattice structure. The insulator-to-metal transition and the MR ratio, defined as [R(0)-R(H)/R(H)], where R(0) and R(H) are resistances in zero and applied fields, is found to vary with the number of unit cells. The samples with 1, 2, 5 and 8 unit cells of Pr0.65Ba0.05Ca0.3MnO3-δ show a transition temperature of 240 K, 230 K, 150 K and 160 K and MR ratio of 540%, 592%, 3150% and 2875 % respectively. We have observed an enhancement of magnetoresistance ratio in case of superlattices with thickness of PBCMO greater than 5 unit cells. We attribute this enhancement to a ferromagnetic biasing provided by the LMO layers acting as a ferromagnetic film below its transition temperature.

Original languageEnglish
Pages (from-to)F8121-F8126
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 2001
Externally publishedYes
EventMagnetic Materials, Structures and Processing for Information Storage - San Francisco, CA, United States
Duration: 24 Apr 200027 Apr 2000


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