Crystallinity and magnetoresistance in calcium doped lanthanum manganites

E. S. Gillman, K. H. Dahmen

Research output: Contribution to journalConference article

Abstract

Thin films of calcium doped lanthanum manganites La1-xCaxMnO3 (LCMO) with x to approximately 0.41 have been prepared on LaAlO3(001) (LAO) Y-stabilized ZrO2(001) (YSZ), and Al2O3(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
Pages (from-to)21-26
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume494
Publication statusPublished - 1 Dec 1997
EventProceedings of the 1997 Fall MRS Symposium - Boston, MA, USA
Duration: 1 Dec 19974 Dec 1997

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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