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2003 | 103 | 2-3 | 315-322
Article title

Magnetic Resonance and Dielectric Studies of a Nonlinear La_3Ga_{5.5}Ta_{0.5}O_{14} Single Crystal Doped with Erbium

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EN
Abstracts
EN
Single crystal of erbium doped La_3Ga_{5.5}Ta_{0.5}O_{14} grown by the Czochralski method have been investigated by electron paramagnetic resonance and dielectric spectroscopy methods. Dielectric permittivity ε measurements performed in 90-440 K temperature range have shown negligible dispersion for 1 kHz - 1 MHz frequencies and a Curie-Weiss type behaviour with C=47700 K andθ=-340 K. Electron paramagnetic resonance studies have revealed the presence of two different paramagnetic, monoclinic centres. The calculated g factor values are: g_1=1.449, g_2=11. 534, g_3=4.24 for the main M_1 centre and g_1=1.98, g_2=4.169, g_3=4.25 for the weaker M_2 centre. The temperature dependence of EPR line intensity for centre M_1 and M_2 is quite different - while lines attributed to M_1 could only be observed at low temperatures, below 20 K, lines of M_2 centre persisted up to 200 K. The M_1 centre is connected with Er^{3+} ion entering substitutionally into La^{3+} site, while M_2 is probably connected with 3d ions at the same site, unintentionally introduced into the material as an admixture.
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Contributors
author
  • Institute of Physics, Technical University of Szczecin, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, Technical University of Szczecin, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, Technical University of Szczecin, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, Technical University of Szczecin, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, Technical University of Szczecin, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
  • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
author
  • Solid State Section, Department of Physics, University of Athens, Athens, Greece
author
  • Solid State Section, Department of Physics, University of Athens, Athens, Greece
  • Solid State Section, Department of Physics, University of Athens, Athens, Greece
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv103n211kz
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