Crystallinity and magnetoresistance in calcium doped lanthanum manganites

E. S. Gillman, K. H. Dahmen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thin films of calcium doped lanthanum manganites La 1-xCa xMnO 3 (LCMO) with x to approximately 0.41 have been prepared on LaAlO 3(001) (LAO) Y-stabilized ZrO 2(001) (YSZ), and Al 2O 3(0001) (SAP) substrates by liquid delivery metal-organic chemical vapor deposition (LD-MOCVD). The films on YSZ and SAP substrates have a textured, polycrystalline morphology with a preferred orientation of (110). The films on LAO show a single-crystalline morphology and a (100) orientation. Transport measurements show the polycrystalline films have a resistance peak approximately 60 K lower than the films on LAO and, in general, have a much higher overall resistance. The magnetoresistance (MR) ratio ([R(H)-R(0)]/R(H)) is sharply peaked near the maximum in resistance for the films on LAO, while the polycrystalline films show a noticeable absence of this sharply peaked behavior and a flat, rather large (approximately 100%) MR ratio over a large temperature range. These results will be discussed in terms of grain boundary scattering, crystallite size, and magnetization.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsS.J. Pearton, R.J. Shul, E. Wolfgang, F. Ren, S. Tenconi
PublisherMRS
Pages21-26
Number of pages6
Volume494
Publication statusPublished - 1997
Externally publishedYes
EventProceedings of the 1997 Fall MRS Symposium - Boston, MA, USA
Duration: 1 Dec 19974 Dec 1997

Other

OtherProceedings of the 1997 Fall MRS Symposium
CityBoston, MA, USA
Period1/12/974/12/97

Fingerprint

Manganites
Lanthanum
Magnetoresistance
Calcium
Organic Chemicals
Organic chemicals
Substrates
Crystallite size
Crystal orientation
Chemical vapor deposition
Magnetization
Grain boundaries
Metals
Scattering
Crystalline materials
Thin films
Liquids

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Gillman, E. S., & Dahmen, K. H. (1997). Crystallinity and magnetoresistance in calcium doped lanthanum manganites. In S. J. Pearton, R. J. Shul, E. Wolfgang, F. Ren, & S. Tenconi (Eds.), Materials Research Society Symposium - Proceedings (Vol. 494, pp. 21-26). MRS.

Crystallinity and magnetoresistance in calcium doped lanthanum manganites. / Gillman, E. S.; Dahmen, K. H.

Materials Research Society Symposium - Proceedings. ed. / S.J. Pearton; R.J. Shul; E. Wolfgang; F. Ren; S. Tenconi. Vol. 494 MRS, 1997. p. 21-26.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gillman, ES & Dahmen, KH 1997, Crystallinity and magnetoresistance in calcium doped lanthanum manganites. in SJ Pearton, RJ Shul, E Wolfgang, F Ren & S Tenconi (eds), Materials Research Society Symposium - Proceedings. vol. 494, MRS, pp. 21-26, Proceedings of the 1997 Fall MRS Symposium, Boston, MA, USA, 1/12/97.
Gillman ES, Dahmen KH. Crystallinity and magnetoresistance in calcium doped lanthanum manganites. In Pearton SJ, Shul RJ, Wolfgang E, Ren F, Tenconi S, editors, Materials Research Society Symposium - Proceedings. Vol. 494. MRS. 1997. p. 21-26
Gillman, E. S. ; Dahmen, K. H. / Crystallinity and magnetoresistance in calcium doped lanthanum manganites. Materials Research Society Symposium - Proceedings. editor / S.J. Pearton ; R.J. Shul ; E. Wolfgang ; F. Ren ; S. Tenconi. Vol. 494 MRS, 1997. pp. 21-26
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