Structural evidence for Ta-tetramerization displacements in the charge-density-wave compound (TaSe4)2I from x-ray anomalous diffraction.
作者： V. Favre-Nicolin , S. Bos , J. E. Lorenzo , J-L. Hodeau , J-F. Berar
DOI: 10.1103/PHYSREVLETT.87.015502
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摘要: We use the anomalous x-ray diffraction technique to investigate nature of tantalum displacement pattern in modulated phase charge-density-wave compound (TaSe4)2I. In addition known acousticlike modulation, we find first direct evidence for condensation opticlike Ta displacements along metallic chains corresponding an LLSS long and short in-chain Ta-Ta distances (Ta-tetramerization modes). This result confirms a previous model which interaction electronically coupled optic modes with long-wavelength acoustic shear leads modulation mixed character.
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