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- W2047646817 abstract "The influence of ultrasonically induced changes in the electron-spin-resonance spectrum of ${mathrm{Fe}}^{3+}$ ions in ${mathrm{Al}}_{2}$${mathrm{O}}_{3}$ is measured in a low magnetic field, i.e., below 300 G. The ESR frequency is 12.15 GHz and the acoustic frequency is the same within a range of ifmmodepmelsetextpmfi{} 30 MHz. Measurements were done at various power levels, orientations of the magnetic field, ultrasonic frequencies, and liquid-helium temperatures. The results of this experiment suggest an antisaturation effect instead of a saturation effect reported by previous investigators in this field. When the paramagnetic sample is in an unsaturated region, the ultrasonic stress field enhances the ESR absorption. This effect decreases as the difference between the resonant frequency and the ultrasonic frequency increases. The maximum in the excess absorption, as a function of the frequency difference (${f}_{mathrm{phonon}}ensuremath{-}{f}_{mathrm{rf}}$), appears to be shifted to small positive values at $ensuremath{theta}={57}^{ensuremath{circ}}$, while for $ensuremath{theta}={0}^{ensuremath{circ}}$ there is no apparent shift ($ensuremath{theta}$ is the angle between the dc field and the $C$ axis)." @default.
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- W2047646817 date "1968-02-10" @default.
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- W2047646817 title "Ultrasonically Induced Changes in ESR Spectra ofFe3+-Doped Sapphire" @default.
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- W2047646817 doi "https://doi.org/10.1103/physrev.166.234" @default.
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