93Nb NMR of the random-field-dominated relaxor transition in pure and doped SBN
Autor(en): | Blinc, R. Gregorovič, A. Zalar, B. Pirc, R. Seliger, J. Kleemann, W. Lushnikov, S.G. Pankrath, R. |
Stichwörter: | barium derivative; niobium; strontium, article; mathematical analysis; mathematical model; nuclear magnetic resonance; phase transition; polarization; temperature dependence | Erscheinungsdatum: | 2001 | Journal: | Physical Review B - Condensed Matter and Materials Physics | Volumen: | 64 | Ausgabe: | 13 | Startseite: | 1341091 | Seitenende: | 1341099 | Zusammenfassung: | The ferroelectric relaxor transitions in Sr0.61Ba0.39Nb2O6 (SBN61) and Sr0.61-yCeyBa0.39Nb2O6 (SBN61:Ce y=0.0066) have been studied by quadrupole perturbed 93Nb NMR. The spectra are inhomogeneous frequency distributions f(ν) consisting of a central component due to the 1/2↔ - 1/2 transition and a broad background due to the satellite transitions. From the temperature dependence of the width and position of the central component spectrum and from the T dependence of T2 we determined the T dependence of the Edwards-Anderson order parameter and of the normalized spontaneous polarization P. The random bond-random field Ising model parameters are J0=485 K, J=388 K, and Δ/J2=0.14. The random-field contribution Δ̃=Δ/J2 is here by two orders of magnitude larger than in the perovskite relaxor PbMg1/3Nb2/3O3 (PMN). |
ISSN: | 01631829 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035494337&partnerID=40&md5=5b03e16e680acc7ba4d2ca8da3dd3299 |
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