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2004 | 105 | 1-2 | 93-98
Article title

Mesoscopic Ordering Effects in Single-Crystalline Thin Films of Lanthanum Manganites

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EN
Abstracts
EN
We have investigated thin films of lanthanum manganites epitaxially grown by pulsed laser deposition on single-crystalline substrates. X-ray diffraction studies show that the characteristic feature of the investigated films is a superposition of fractions with long range atomic order in the basic single-crystalline matrix, and mesoscopic order in the clusterized structure encompassing the Mn-O layers. A detailed analysis of diffusive scattering shows that the size of metallic clusters and their volume concentration in the dielectric matrix varies. In the case of a small size and concentration, the metallic clusters in low temperature behave as quantum dots and their presence leads to a tunneling mechanism of conductivity with characteristic R(T)= const. In the case of large cluster size, the discrete energy levels become smeared. It appears also that the optical, transport, and magnetic properties of the investigated films depend critically on the distribution of Mn^{2+}, Mn^{3+}, and Mn^{4+} ions in the clusters.
Keywords
EN
Contributors
author
  • Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine (Donetsk), Donetsk, Ukraine
author
  • Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine (Donetsk), Donetsk, Ukraine
author
  • Donetsk Institute for Physics & Technology, National Academy of Sciences of Ukraine (Donetsk), Donetsk, Ukraine
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
References
  • 1. J.M.D. Coey, M. Viret, S. von Molnar, Adv. Phys., 48, 167, 1999
  • 2. Q. Huang, A. Santoro, J.W. Lynn, R.W. Erwin, J.A. Borchers, J.L. Peng, R.L. Greene. Phys. Rev. B, 55, 14987, 1997
  • 3. Z.A. Samoilenko, V.D. Okunev, E.I. Pushenko, T.A. D'yachenko, A. Cherenkov, P. Gierlowski, S.J. Lewandowski, A. Abal'oshev, A. Klimov, A. Szewczyk. Techn. Phys., 48, 250, 2003
  • 4. E.L. Nagaev, Usp. Fiz. Nauk, 166, 833, 1996
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n121kz
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