Spotlight
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Chemical control of negative thermal expansion
Most materials expand when they are heated, but a few do the opposite as a result of certain kinds of atomic vibrations. In this work, which appears on the cover of JACS, the layered perovskite Ca3–xSrxMn2O7 is shown to exhibit a switching from a material exhibiting uniaxial negative to positive thermal expansion as a function of x.
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Excellent Wannier90 software dev workshop in San Sebastián this week. Thanks to all participants & contributors! pic.twitter.com/WmRqgQvXrf