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Department Feature
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. Read More

Department News for Friday July 3rd, 2009

International Year of Astronomy

Four hundred years ago Galileo became the first scientist to point a telescope skyward, beginning the fields of astronomy and physics. In recognition, 2009 has been declared the International Year of Astronomy by the International Astronomical Union. Throughout this year, the BYU Astronomical Society will be holding numerous outreach and celebratory activities. [Read More]

Happy Birthday to Ben Taylor!

Sunday is Ben Taylor's birthday. Read more to find out what Ben does in the department. [Read More]

Astronomy Picture of the Day

Perihelion and Aphelion

This year Aphelion, the point in Earth's elliptical orbit when it is farthest from the Sun, occurs tomorrow, July 4th. Of course, that doesn't affect the seasons on our fair planet. Those are determined by the tilt of Earth's axis of rotation and not Earth's distance from the Sun, so July is still winter in the south and summer in northern hemisphere. [Read More]

The Astronomy Picture of the Day is a NASA web site that features a new image or photograph of the universe each day.

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