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Electron-spin-resonance linewidth data, taken between 6 and 23 K, are compared with pulse-saturation-recovery times, measured between 2.5 and 3.5K, for three samples of Nd-doped lanthanum magnesium nitrate. Both types of measurements indicate a dominant Orbach relaxation process. The relationship between the two types of data in the presence of a phonon-limited Orbach relaxation process is discussed. The fact that the linewidth data were uniform among the different samples, whereas the pulse-saturation-recovery data were concentration dependent, is interpreted as evidence that the Orbach relaxation process in this salt is phonon limited.
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Cristea et al. (1971) studied this question.
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