Alternative model for the structural modulation in NbSe3 and m-TaS3 - art.no. 115423

Citation
A. Prodan et al., Alternative model for the structural modulation in NbSe3 and m-TaS3 - art.no. 115423, PHYS REV B, 6411(11), 2001, pp. 5423
Citations number
82
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6411
Issue
11
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010915)6411:11<5423:AMFTSM>2.0.ZU;2-B
Abstract
A model is proposed for the sliding charge density wave mechanism in the is ostructural quasi-one-dimensional compounds NbSe3 and m-TaS3. It is based o n an assumption that below either of the two onset temperatures T-1 and T-2 both modulation modes are present and form small statistically distributed domains along particular trigonal prismatic columns, i.e., along type III below T-1 and in addition along type I below T-2. Presuming the domains are of comparable sizes to the coherence lengths in the diffraction experiment s, their disordered distribution results in a selective contribution to the reciprocal space in both temperature regions, which is in good accord with the diffraction experiments. The model might form the basis for a better e xplanation of the twinkling domains and low temperature tunneling microscop ic images, which were not fully understood on basis of the old model with a selective occupation of the two column types by the two modulation modes.