The role of charge density waves in structural transformations of 1T TaS 2
1975; Taylor & Francis; Volume: 31; Issue: 2 Linguagem: Inglês
10.1080/14786437508228930
ISSN0031-8086
AutoresC. B. Scruby, Philip M. Williams, G. Parry,
Tópico(s)Iron-based superconductors research
ResumoAbstract Electron and X-ray diffraction studies have identified three metastable phases in 1T TaS2. Extra reflexions are interpreted as arising from charge density waves coupled to periodic distortions modulating a trigonal lattice. These waves are incommensurate with the matrix in 1T1 and 1T2, but form a commensurate super-lattice in 1T3. Within 1T2, the temperature dependence of the wave vector is correlated with a change in the cross-section of the Fermi surface, while the diffuse scattering which accompanies the discrete reflexions in 1T1 is discussed as an image of this surface in the phonon spectrum. Changes in the stacking of distortions and in their amplitude are also reported.
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