X-ray spectroscopy of thermally distorted electronic states in crystals |
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Authors: | V E Dmitrienko E N Ovchinnikova K Ishida |
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Institution: | (1) A. V. Shubnikov Institute of Crystallography, 117333 Moscow, Russia;(2) Physics Department, Moscow State University, 119899 Moscow, Russia;(3) Department of Physics, Science University of Tokyo, Noda-shi, Chiba 278, Japan |
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Abstract: | A new type of x-ray spectroscopy is proposed which can detect the thermal-motion-induced distortions of atomic electronic
states in crystals. It is shown that those distortions can cause extra Bragg reflections (so-called forbidden reflections)
and that their intensity should grow with increasing temperature. The reason is that the thermal displacements, which change
the symmetry of atomic environment, can modify the tensor amplitude of x-ray resonant scattering. In the first approximation,
the structure factor of extra reflections is proportional to the reflection vector H and to the mean-square thermal displacement
for optical phonons. It is demonstrated that the forbidden resonant reflections, observed recently in Ge, could be caused
by the thermal motion.
Pis’ma Zh. éksp. Teor. Fiz. 69, No. 12, 885–889 (25 June 1999)
Published in English in the original Russian journal. Edited by Steve Torstveit. |
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