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Magnetic resonance in Pb_xNb_yO_z-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 Ioffe Institute, St. Petersburg, Russia

²FB Physik, Universitat Osnabruck, Osnabruck, Germany

Email: hike.asatryan@mail.ioffe.ru

Выставление онлайн: 20 июля 2005 г.

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The simulation of chemical fluctuation regions in the PMN-like relaxors by growth of the Pb_xNb_yO_z-ceramics was performed. Different Pb_xNb_yO_z-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 Pb_xNb_yO_z-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 Pb_xNb_yO_z-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 Pb_xNb_yO_z-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".

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