Annealing effect on transport properties of Nd0.67Sr0.33MnO3 thin films

Pattabiraman, M. (author)

Murugaraj, P. (author)

Rangarajan, G. (author)

Prasad, V. (author)

Subramanyam, S. V. (author)

Sastry, V. S. (author)

Koo, S. M. (author)

(creator_code:org_t)

Springer Science and Business Media LLC, 2000
2000
English.
In: Pramana (Bangalore). - : Springer Science and Business Media LLC. - 0304-4289 .- 0973-7111. ; 55:3, s. 455-469

Related links:: http://eprints.iisc....; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Annealing dependence of the lattice parameter, resistivity, magnetoresistance and thermopower have been studied on Nd0.87Sr0.33MnO3 thin films deposited on LaAlO3 and alumina substrates by pulsed laser ablation. Upon annealing at 800 degrees C and 1000 degrees C the lattice constant of the LaAlO3 film tends toward that of the bulk target due to reduction in oxygen vacancies. This results in a metal-insulator transition at temperatures which increase with progressive annealing along with a decrease in the observed low temperature MR. Using a magnon scattering model we estimate the e(g) bandwidth of the film annealed at 1000 degrees C and show that the magnon contribution to the resistivity is suppressed in a highly oxygen deficient film and gains prominence only upon subsequent annealing. We also show that upon annealing, the polaron concentration and the spin cluster size increases in the paramagnetic phase, using an adiabatic polaron hopping model which takes into account an exchange dependent activation energy above the resistivity peak.

By the author/editor: Pattabiraman, M.; Murugaraj, P.; Rangarajan, G.; Prasad, V.; Subramanyam, S. ...; Sastry, V. S.; show more...; Koo, S. M.; Rao, K. V.; show less...

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