Observation of Soft Phonon Modes in 1T-TaS_2 by means of X-ray Thermal Diffuse Scattering(Condensed Matter : Structure, Mechanical and Thermal Properties)

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概要

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• The thermal diffuse scattering of synchrotron x-rays was measured for a single crystal of 1T-TaS_2 along high symmetry direction in reciprocal space within the temperature range of 300-460 K. Least-squares analysis in terms of a lattice dynamics yielded phonon dispersion curves. The dispersion curves revealed Kohn anomalies both in a longitudinal acoustic (LA) mode and transverse acoustic (TA_∥) mode polarized along b^* direction. The results show that the softened TA_∥ modes trigger the rotation of the ordering vector in the nearly commensurate phase at low temperature.

• 2004-11-15

著者

• Tanaka Masahiko

  Institute Of Materials Structure Science High Energy Accelerator Research Organization

• Machida Yo

  Department Of Materials Science And Engineering Tokyo Institute Of Technology:(present Address)depar

• Ohkubo Koichi

  Materials And Structure Laboratory Tokyo Institute Of Technology

• Hanashima Takayasu

  Department Of Chemistry The University Of Tokyo

• Sasaki Satoshi

  Department Of Applied Physics Faculty Of Engineering Nagoya University

• Yamawaki Kouji

  Materials and Structure Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama 226-8503, Japan

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