Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La0.6 Sr0.4 MnO3 thin films studied by x-ray magnetic circular dichroism

G. Shibata, K. Yoshimatsu, E. Sakai, V. R. Singh, V. K. Verma, K. Ishigami, T. Harano, T. Kadono, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, A. Sawa, H. Kumigashira, M. Oshima, T. Koide, A. Fujimori

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12 Citations (Scopus)

Abstract

Metallic transition-metal oxides undergo a metal-to-insulator transition (MIT) as the film thickness decreases across a critical thickness of several monolayers (MLs), but its driving mechanism remains controversial. We have studied the thickness-dependent MIT of the ferromagnetic metal La0.6Sr0.4MnO3 by x-ray absorption spectroscopy and x-ray magnetic circular dichroism. As the film thickness was decreased across the critical thickness of the MIT (6-8 ML), a gradual decrease of the ferromagnetic signals and a concomitant increase of paramagnetic signals were observed, while the Mn valence abruptly decreased towards Mn3+. These observations suggest that the ferromagnetic phase gradually and most likely inhomogeneously turns into the paramagnetic phase and both phases abruptly become insulating at the critical thickness.

Original languageEnglish
Article number235123
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number23
DOIs
Publication statusPublished - 2014 Jun 23
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Shibata, G., Yoshimatsu, K., Sakai, E., Singh, V. R., Verma, V. K., Ishigami, K., Harano, T., Kadono, T., Takeda, Y., Okane, T., Saitoh, Y., Yamagami, H., Sawa, A., Kumigashira, H., Oshima, M., Koide, T., & Fujimori, A. (2014). Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La0.6 Sr0.4 MnO3 thin films studied by x-ray magnetic circular dichroism. Physical Review B - Condensed Matter and Materials Physics, 89(23), [235123]. https://doi.org/10.1103/PhysRevB.89.235123