Вышедшие номера
Magnetic resonance in PbxNbyOz-ceramics as a system containing chemical fluctuation regions
Vikhnin V.S.1, Asatryan H.R.1, Zakharchenya R.I.1, Kutsenko A.B.1, Kapphan S.E.2
1A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
2FB Physik, Universitat Osnabruck, Osnabruck, Germany
Email: hike.asatryan@mail.ioffe.ru
Выставление онлайн: 20 июля 2005 г.

The simulation of chemical fluctuation regions in the PMN-like relaxors by growth of the PbxNbyOz-ceramics was performed. Different PbxNbyOz-clusters (chemically and structurally) coexist in such a ceramics. Hole polarons and bi-polarons, "Cr3+ - two polaronic holes" paramagnetic complexes were considered for an explanation of EPR spectra in PbxNbyOz-ceramics. Dynamical averaging and light induced effects, and significant effects of reduction treatment giving a co-existence of Nb5+ and Nb3+ ions as well as of strong internal magnetic field were discovered in such a ceramics. The latter could be related to antiferromagnetic phase realization in PbxNbyOz-clusters containing high enough concentration of magnetic Nb3+ host lattice ions. Such a situation leads to antiferromagnetic resonance on Nb3+ ions as well as to EPR of Cr3+-related paramagnetic complexes in Nb3+-induced internal magnetic field. Charge transfer vibronic excitons (CTVE) in free and in CTVE-phase states were detected in PbxNbyOz-ceramics by photoluminescence studies. Supported in part by RFBR (03-02-17589), and by Programs "Low dimension quantum structures" and "Spin-dependent effects in solids and spintronics".
  1. L. E. Cross. Ferroelectr. 76, 241 (1987); 151, 305 (1994)
  2. Y. Yan, S.J. Pennycook, Z. Xu, D. Viehland. Appl. Phys. Lett. 72, 3145 (1998)
  3. V.S. Vikhnin, R.I. Eglitis, S. Kapphan, E.A. Kotomin, G. Borstel. Europhys. Lett. 56, 5, 702 (2001)
  4. V.S. Vikhnin, R.I. Eglitis, S.E. Kapphan, G. Borstel, E.A. Kotomin. Phys. Rev. B 65, 104 304 (2002)
  5. V.S. Vikhnin, S.E. Kapphan, R.I. Eglitis, R. Pirc. Phys. Stat. Sol. (c) 2, 1, 120 (2004)
  6. V.S. Vikhnin, R.I. Zakharchenya, H.R. Asatryan, A.B. Kutsenko, S.E. Kapphan. Applied Magnetic Resonanse 28, 1, 1 (2005)
  7. V.S. Vikhnin, R.I. Zakharchenya, H.R. Asatryan, A.B. Kutsenko, S.E. Kapphan, H. Eickmeyer. Ferroelectrics, 307, 67 (2004)
  8. T. Okamura, Y. Torizuka, Y. Kojima. Phys. Rev. 82, 285 (1951)
  9. C. Kittel. Phys. Rev. 82, 565 (1951)

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