Modulated corrugations in the crystal structure of the superconductor CaAlSi

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...

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Veröffentlicht in:	Acta crystallographica. Section B, Structural science Structural science, 2006-10, Vol.62 (5), p.710-718
Hauptverfasser:	Sparta, Karine M., Müller, Ralf, Merz, Michael, Roth, Georg, Adelmann, Peter, Wolf, Thomas
Format:	Artikel
Sprache:	eng
Schlagworte:	CaAlSi commensurately modulated structures Condensed matter: structure, mechanical and thermal properties Crystal structure Crystalline state (including molecular motions in solids) Crystallographic aspects of phase transformations pressure effects Crystallography Diffraction Exact sciences and technology Inorganic compounds Physics Polymorphism powder X-ray diffraction single-crystal X-ray diffraction Structure of solids and liquids crystallography Structure of specific crystalline solids Superconductors X-rays
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Beschreibung
Zusammenfassung:	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.
ISSN:	0108-7681 2052-5192 1600-5740 2052-5206
DOI:	10.1107/S0108768106025900