Journal of the Korean Vacuum Society (한국진공학회지)

The Korean Vacuum Society (한국진공학회)
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Magnetoresistance behavior of $La_{1-\chi}Sr_\chiCoO_{3-\delta}$ films around the metal-insulator transition

  • Park, J. S. (q-Psi and Dept. of Physics, Hanyang University) ;
  • Park, H. G. (q-Psi and Dept. of Physics, Hanyang University) ;
  • Kim, C. O. (q-Psi and Dept. of Physics, Hanyang University) ;
  • Lee, Y. P. (q-Psi and Dept. of Physics, Hanyang University) ;
  • V. G. Prokhorov (Institute of Metal Physics, NASU)
  • Published : 2003.10.01
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Abstract

The magnetoresistance (MR) of $La_{1-\chi}S_{\chi}CoO_{3-\delta}$ films prepared by pulsed-laser deposition were investigated in order to clarify the magnetotransport properties around the metal-insulator transition. For the films in the metallic state ($\chi$ > 0.25), the MR(T) manifests a small peak at the Curie temperature due to the spin-disorder scattering. The transition of the film into the insulating state ($\chi\;\leq$ 0.25) is accompanied by an essential growth of the MR and results in a significant increase in the MR(T) with decreasing temperature, due to a phase separation into the ferromagnetic-metal clusters and the insulating matrix.

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References

  1. S. Jin, T. H. Tiefel, M. McCormack, R. A. Fastnacht, R. Ramesh, and L. H. Chen, Science 264, 413 (1994) https://doi.org/10.1126/science.264.5157.413
  2. H. Y. Hwang, S.-W. Cheong, N. P. Ong, and B. Batlogg, Phys. Rev. Lett. 77, 2041 (1996) https://doi.org/10.1103/PhysRevLett.77.2041
  3. T. Saitoh, T. Mizokawa, A. Fujimori, M. Abbate, Y. Takeda, and M. Takano, Phys. Rev. B 56, 1290 (1997) https://doi.org/10.1103/PhysRevB.56.1290
  4. S. Yamaguchi, Y. Okimoto, H. Taniguchi, and Y Tokura, Phys. Rev. B 53, R2926 (1996) https://doi.org/10.1103/PhysRevB.53.R2926
  5. R. R. Heikes, R. C. Miller, and R. Mazelsky, Physica 30, 1600 (1964) https://doi.org/10.1016/0031-8914(64)90182-X
  6. V. G. Bhide, D. S. Rajoria, C. N. R. Rao, and R. G. Rama, Phys. Rev. B 12, 2832 (1975) https://doi.org/10.1103/PhysRevB.12.2832
  7. N. Furukawa, J. Phys. Soc. Jpn. 64, 3164 (1995) https://doi.org/10.1143/JPSJ.64.3164
  8. R. Mahendiran, A. K. Raychaudhuri, A. Chainani, and D. D. Sarma, J. Phys.: Condens. Matter. 7, L561 (1995)
  9. S. Yamaguchi, H. Taniguchi, H. Takagi, T. Arima, and Y. Tokura, J. Phys. Soc. Jpn. 54, 1885 (1995)
  10. M. Itoh, I. Natori, S. Kubota, and K. Motoya, J Phys. Soc. Jpn. 63, 1486 (1994) https://doi.org/10.1143/JPSJ.63.1486