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S.R. McHale J.W. McClory J.C. PetroskyJ. Wu R. Palai P.A. DowbenI. Ketsman 《Materials Letters》2011,65(10):1476-1478
The effective Debye temperature of ytterbium and gallium in Yb:GaN thin films has been obtained using X-ray photoemission spectroscopy. The vibrational motion normal to the surface results in a dimunition of photoemission intensities from which we have estimated the effective Debye temperatures of 221 ± 30 K and 308 ± 30 K for Yb and Ga, respectively. The difference between the measured values for Yb and Ga suggests that the Debye temperatures are influenced by the local environment. The smaller effective surface Debye temperature for Yb correlates to a soft, strained surface, possibly due to an increased Yb―N bond length as compared to the Ga―N bond length. 相似文献
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Theory of Computing Systems - Modern data management systems extensively use parallelism to speed up query processing over massive volumes of data. This trend has inspired a rich line of research... 相似文献
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