Usually when we talk about scientific modeling around the Ames Laboratory, we’re talking about the science: using visual, mathematical, or operational methods to better understand the chemical and physical properties of our world. Because that’s what we do. But this spring we asked professional photographer Shauna Stephenson to set up her own lab here—a photography lab, where for her week-long visit she invited our scientists to model in an entirely different sense, for the camera.
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Extensive calculations revealed that the calcium-iridium-oxygen compound CaIrO3 is a Slater-type insulator, putting to rest the debate of whether the insulating nature of the metal oxide is Mott-type or Slater-type.
A compound made out of ytterbium (Yb), platinum (Pt), and bismuth (Bi) offers researchers the opportunity to watch the birth of magnetic behavior by applying small changes in magnetic field or temperature. Despite the electrons having effective masses of nearly 10,000 times their normal mass when YbPtBi becomes magnetic, researchers have been able to monitor its quantum oscillations, key for determining important electronic properties. From the results they deduced that as it moves further and further from magnetism its electrons lose weight fast. These findings provide key ins
Starting September 23, 2015, the DOE EERE Small Business Vouchers Pilot is accepting proposals for Round 1 through October 23, 2015. The pilot program sponsored by the DOE EERE National Lab Impact Initiative. The goal of the program is to increase engagement between the U.S. small business community and DOE’s national laboratories. A small business operating in the clean energy space can apply for a voucher to be used on their behalf at a national lab.
October 5, 2015
Scientists at the U.S. Department of Energy’s Ames Laboratory have developed molecular modeling simulations and new theoretical formulations to help understand and optimize catalytic reactions that take place in chemical environments where the reactant “ingredients” for catalysis are not well mixed.
Two types of magnetic configurations—antiferromagnetism (AFM) and ferromagnetism (FM)—have been found to compete with each other, thwarting the rise of superconductivity in iron pnictides, a class of high-temperature superconductors. In an AFM fluctuation electron spins temporary align in an alternating checkboard pattern while electron spins align temporary in the same direction in a FM fluctuation. While FM fluctuations have been suggested in the iron pnictide superconductors by theoretical calculations, the possible existence of FM fluctuations has not yet been examined from a experim