Crystal structure of the (formula presented) superconductors near (formula presented)

Serena Margadonna; Kosmas Prassides; Ioannis Arvanitidis; Michael Pissas; Georgios Papavassiliou; Andrew N. Fitch

doi:10.1103/PhysRevB.66.014518

Crystal structure of the (formula presented) superconductors near (formula presented)

Serena Margadonna, Kosmas Prassides, Ioannis Arvanitidis, Michael Pissas, Georgios Papavassiliou, Andrew N. Fitch

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Precise structural information on the (formula presented) superconductors in the vicinity of (formula presented) is derived from high-resolution synchrotron x-ray powder diffraction measurements. We find that a hexagonal superstructure, accompanied by doubling of the c axis, ordering of Mg and Al in alternating layers, and a shift of the B layers towards Al by (formula presented) is formed. The unusually large width of the (formula presented) superlattice peak implies the presence of microstrain broadening, arising from anisotropic stacking of Al and Mg layers and/or structural modulations within the (formula presented) plane. The ordered phase survives only over a limited range of compositions away from the optimum (formula presented) doping level.

Original language	English
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.66.014518
Publication status	Published - 2002
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.66.014518

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Crystal structure of the (formula presented) superconductors near (formula presented). / Margadonna, Serena; Prassides, Kosmas; Arvanitidis, Ioannis; Pissas, Michael; Papavassiliou, Georgios; Fitch, Andrew N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 1, 2002, p. 1-5.

Research output: Contribution to journal › Article › peer-review

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AU - Pissas, Michael

AU - Papavassiliou, Georgios

AU - Fitch, Andrew N.

PY - 2002

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AB - Precise structural information on the (formula presented) superconductors in the vicinity of (formula presented) is derived from high-resolution synchrotron x-ray powder diffraction measurements. We find that a hexagonal superstructure, accompanied by doubling of the c axis, ordering of Mg and Al in alternating layers, and a shift of the B layers towards Al by (formula presented) is formed. The unusually large width of the (formula presented) superlattice peak implies the presence of microstrain broadening, arising from anisotropic stacking of Al and Mg layers and/or structural modulations within the (formula presented) plane. The ordered phase survives only over a limited range of compositions away from the optimum (formula presented) doping level.

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Crystal structure of the (formula presented) superconductors near (formula presented)

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