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- W2034127411 startingPage "2840" @default.
- W2034127411 abstract "The ESR linewidth of the superconducting oxide ${mathrm{GdBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ in the normal state is studied experimentally at 300 K. Several factors that strongly affect its shape and width---skin effect, contribution of the ${mathrm{ensuremath{omega}}}_{mathrm{ensuremath{-}}}$ resonance, and chemical preparation---are examined carefully, and in this context some experimental results on ${mathrm{Gd}}_{2}$${mathrm{O}}_{3}$ are presented. It is shown that Q-band spectra from both ${mathrm{GdBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ powders (Lorentzian line) and single crystals (isotropic spectra) are of particular interest for theoretical analysis. The g factor of ${mathrm{Gd}}^{3+}$ in ${mathrm{GdBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ is found to be 2.01ifmmodepmelsetextpmfi{}0.01. Experimental results are given that indicate the existence of an exchange-narrowed dipolar line, via the Van Vleck--Anderson mechanism and not the Plefka-Barnes mechanism. Both the second moment of the ESR dipolar line, and the contribution of exchange to the fourth moment for a powder and for selected field orientations in the case of a single crystal are calculated numerically. Comparison of the predictions of the Van Vleck--Anderson-Weiss model with experimental results suggests that the nonadiabatic situation is present even at the Q band, and the coupling constant between nearest neighbors is found to be 2J/k=-0.3 K. Finally, the effect of the coupling with the conduction electrons is discussed, and an experimental check is made in a dilute sample." @default.
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- W2034127411 date "1993-02-01" @default.
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- W2034127411 title "Origin of the ESR linewidth in the normal phase ofGdBa2Cu3O7" @default.
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- W2034127411 doi "https://doi.org/10.1103/physrevb.47.2840" @default.
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