title: LaSeTe2-temperature dependent structure investigation and electron holography on a charge-density-wave-hosting compound.
abstract: Single crystals of LaSeTe(2) have been prepared by reaction of the elements in a LiCl/RbCl flux at 970 K for seven days. Satellite reflections observed in diffraction experiments indicate the presence of an incommensurate lattice distortion, which is of the charge-density-wave (CDW) type. The modulated structure has been solved from X-ray data at 173, 293, and 373 K. LaSeTe(2) crystallizes in the 3+1-dimensional orthorhombic superspace group Cmcm(00gamma)s00 (No. 63.2) with lattice parameters of a=4.295(1), b=25.371(4), c=4.306(1) A (173 K), a=4.297(1), b=25.408(4), c=4.309(1) A (293 K), and a=4.309(1), b=25.481(6), c=4.321(1) A (373 K). The modulation vector q=(0, 0, 0.288) does not change over the temperature interval. Electron holographic investigations confirm the existence of the modulation and help to visualize the charge-density wave.
authors.affiliation: Institute of Inorganic Chemistry, University of Technology Dresden, Mommsenstr. 13, 01062 Dresden, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Doert
authors.forename: Boniface Polequin Tsinde
authors.initials: BP
authors.lastname: Fokwa
authors.forename: Paul
authors.initials: P
authors.lastname: Simon
authors.forename: Sven
authors.initials: S
authors.lastname: Lidin
authors.forename: Tilo
authors.initials: T
authors.lastname: Söhnel