Insulator-metal transition induced by interlayer coupling in la0.6Sr0.4Mno3/srtio3 superlattices

M. Izumi, Y. Ogimoto, Y. Okimoto, T. Manako, P. Ahmet, K. Nakajima, T. Chikyow, M. Kawasaki, Y. Tokura

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Abstract

The electronic and magnetic properties of perovskite superlattices composed of five unit-cell layers of ferromagnetic metal La0.6Sr0.4MnO3 and nonmagnetic band insulator SrTiO3 with varying layer thickness have been systematically investigated. The superlattices have well-defined periodic stacking with no sign of interlayer diffusion. The spin canting at the interfaces in La0.6Sr0.4MnO3 layers manifests itself as a suppressed magnetization and huge magnetoresistance subsisting to low temperature. The transport properties show a clear crossover from insulating to metallic perhaps by an increase in the interlayer electron hopping through SrTiO3 layers when the SrTiO3 layer thickness is reduced. This crossover is also discerned in the infrared optical spectra as the filling of absorption in the low-energy region.

Original languageEnglish
Article number064429
Pages (from-to)644291-644296
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number6
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Izumi, M., Ogimoto, Y., Okimoto, Y., Manako, T., Ahmet, P., Nakajima, K., Chikyow, T., Kawasaki, M., & Tokura, Y. (2001). Insulator-metal transition induced by interlayer coupling in la0.6Sr0.4Mno3/srtio3 superlattices. Physical Review B - Condensed Matter and Materials Physics, 64(6), 644291-644296. [064429]. https://doi.org/10.1103/PhysRevB.64.064429