Physics & Astronomy

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Current research and activities in the Department of Physics and Astronomy.

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Modulated Crystal Structures

Harold Stokes, Branton Campbell, and Dorian Hatch recently announced an exhaustive group-theoretical enumeration and classification of the distortion symmetries that can arise from one-dimensional incommensurate modulations of three-dimensional crystal structures. Acta Cryst. A63, 365-373 (2007). Such wave-like modulations accompany a variety of important physical phenomena (e.g. magnetism and superconductivity) and dramatically complicate any quantitative structure analysis. This work will make it much easier to interpret basic experimental diffraction data. The figure illustrates a short-range displacive modulation observed in magnetoresistive La1.8Sr2.2Mn2O7.

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