title: Modulated corrugations in the crystal structure of the superconductor CaAlSi.
abstract: We report the crystal structure analyses of CaAlSi from single-crystal and powder X-ray diffraction and the existence of two commensurately modulated phases, a sixfold and a fivefold modulated structure. This polymorphism seems to be correlated to the thermal history of the sample. We describe both modulated structures using a three-dimensional and a (3 + 1)-dimensional formalism.
authors.affiliation: Institut für Kristallographie der RWTH Aachen, Jägerstrasse 17-19, 52056 Aachen, Germany. sparta@xtal.rwth-aachen.de
authors.forename: Karine M
authors.initials: KM
authors.lastname: Sparta
authors.forename: Ralf
authors.initials: R
authors.lastname: Müller
authors.forename: Michael
authors.initials: M
authors.lastname: Merz
authors.forename: Georg
authors.initials: G
authors.lastname: Roth
authors.forename: Peter
authors.initials: P
authors.lastname: Adelmann
authors.forename: Thomas
authors.initials: T
authors.lastname: Wolf