Anisotropic lattice expansion and magnetism in sputter-deposited Ca(La)B6 films

Y. Sakuraba, H. Kato, Fumitaka Sato, T. Miyazaki

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Nanocrystalline thin films of CaB6 and Ca0.995La 0.005B6 were fabricated in this study using rf-magnetron sputtering. X-ray diffraction (XRD) measurements and scanning electron microscopy/energy dispersive spectrometer analyses revealed that lattice expansion of up to 6% with respect to the bulk value occurs along the direction perpendicular to the film plane. It is caused by the trapping of Ar gas into the film. On the other hand, in-plane XRD showed that spacing along the directions within the film plane is shrunk slightly. Large ferromagnetic moment of 0.01-0.02 μB/f.u. was observed in some La-doped films only when the lattice expansion rate was larger than 2.5%. The Curie temperature was found to be markedly higher than 400 K.

Original languageEnglish
Article number140406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number14
DOIs
Publication statusPublished - 2004 Apr 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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