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- W2048232018 abstract "Measurements of the nuclear spin-lattice relaxation rate of ${mathrm{In}}^{115}$, ${mathrm{Sb}}^{121}$, and ${mathrm{Sb}}^{123}$ in InSb over the temperature range 3.8 to 300ifmmode^circelsetextdegreefi{}K are reported. At temperatures exceeding 7ifmmode^circelsetextdegreefi{}K, the dominant relaxation process is via quadrupolar coupling to the lattice vibrations. Below 7ifmmode^circelsetextdegreefi{}K, the total relaxation rate is resolved into a sum of quadrupolar ($frac{1}{T_{1}^{}{}_{}{}^{Q}}$) and background impurity rates. For ${mathrm{Sb}}^{121}$, $frac{1}{T_{1}^{}{}_{}{}^{Q}}$ is proportional to ${T}^{9.5ifmmodepmelsetextpmfi{}0.5}$ ($T=mathrm{temperature}$). A similar result is obtained for the other nuclei, but with reduced accuracy. This result disagrees with predictions based on the Debye model, but agrees with calculations based on a more accurate density-of-states function. Over the entire temperature range 4.2 to 300ifmmode^circelsetextdegreefi{}K, the ratio $frac{T_{1}^{}{}_{}{}^{Q}({mathrm{Sb}}^{123})}{T_{1}^{}{}_{}{}^{Q}({mathrm{Sb}}^{121})}$ is 1.45ifmmodepmelsetextpmfi{}0.05, in agreement with theoretical predictions. The behavior of the ratio $frac{T_{1}^{}{}_{}{}^{Q}({mathrm{In}}^{115})}{T_{1}^{}{}_{}{}^{Q}({mathrm{Sb}}^{121})}$ is quite different; it varies from 3.2 below 25ifmmode^circelsetextdegreefi{}K to 1.4 at high temperatures. This change with increasing temperatures is attributed to the thermal excitation of optical phonons, which are more strongly coupled to In than to Sb nuclei." @default.
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- W2048232018 date "1967-12-10" @default.
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- W2048232018 title "Quadrupolar Nuclear Spin-Lattice Relaxation in InSb at Low and Medium Temperatures" @default.
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- W2048232018 doi "https://doi.org/10.1103/physrev.164.288" @default.
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