A Thin Film Turns into a Ferroelectric
A cube of potassium tantalate behaves like an ordinary dielectric: it doesn't store an electric field. But grow this material as a thin film on a substrate of another crystal, and everything changes.
Oxygen Impurities in Superconductors: Seeing the Unseen
A superconductor is a material that conducts electricity without loss, like water flowing through a perfectly smooth pipe. In copper-based superconductors, tiny oxygen additions act like a volume knob: a bit more and the material starts superconducting; a bit less and it stops. But the oxygen atoms themselves are so small that seeing them directly was impossible.
How to pick a crystal thickness in 50 simulations
A translator at the negotiating table doesn't listen to every word; they grasp the meaning of whole phrases. Electron microscopy poses a similar challenge: you need to figure out the crystal's thickness and its tilt in the beam, and all you have is a diffraction pattern, a mosaic of thousands of bright and dark spots.
A Magnetic Orchestra from Precipitates: How Fe6GeTe2 Nanoparticles Set a Record Curie Temperature
Picture an orchestra in which violins and trumpets play different parts but together create a powerful sound. In a crystal of the layered magnet Fe5GeTe2 doped with nickel, tiny regions of a different phase, Fe6GeTe2 nanoprecipitates, take on the role of those instruments. It is they, not the nickel itself, that keep the material magnetic at 478 kelvin, that is, at 205 degrees Celsius.