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The shape of inhomogeneously broadened resonant lines due to nonlinear contributions

  • Magnetism and Ferroelectricity
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Abstract

A theory of the shape of inhomogeneously broadened resonant lines is developed for the case where the shifts of the spin-packet resonance frequencies are determined by nonlinear (in particular, quadratic) random-field contributions. It is shown that the line shape I(ω) is described by a narrow δ-type curve with broad wings. Homogeneous broadening reduces the intensity I max(ω) and broadens the line. A comparison is made of the calculated and measured 93Nb NMR line shapes for PbMg1/3Nb2/3O3 (PMN) at T=430 K and KTa0.988Nb0.012O3 (KTN). The theory describes well the observed resonant-line shape anomalies. Specific features in the structure of the disordered ferroelectrics PMN and KTN are discussed.

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Authors and Affiliations

  1. Institute for Materials Sciences, National Academy of Sciences of Ukraine, 252680, Kiev, Ukraine

    M. D. Glinchuk & S. N. Nokhrin

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  1. M. D. Glinchuk
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  2. S. N. Nokhrin
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Fiz. Tverd. Tela (St. Petersburg) 40, 1313–1320 (July 1998)

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Glinchuk, M.D., Nokhrin, S.N. The shape of inhomogeneously broadened resonant lines due to nonlinear contributions. Phys. Solid State 40, 1196–1200 (1998). https://doi.org/10.1134/1.1130519

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  • DOI: https://doi.org/10.1134/1.1130519

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