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Results for “INSULATION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Magnons and Phonons Optically Driven out of Local Equilibrium in a Magnetic Insulator
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Antidoping in Insulators and Semiconductors Having Intermediate Bands with Trapped Carriers
Ordinary doping by electrons (holes) generally means that the Fermi level shifts towards the conduction band (valence band) and that the conductivity of free carriers increases. Recently, however, some peculiar doping characteristics were sporadically recorded in different materials without noting the mechanism: electron doping was observed to cause a portion of the lowest unoccupied band to merge into the valance band, leading to a decrease in conductivity. This behavior, that we dub as “antidoping,” was seen in rare-earth nickel oxides SmNiO 3 , cobalt oxides SrCoO 2.5 , Li-ion battery materials, and even MgO with metal vacancies. We describe the physical origin of antidoping as well as its inverse problem—the “design principles” that would enable an intelligent search of materials. We find that electron antidoping is expected in materials having preexisting trapped holes and is caused by the annihilation of such “hole polarons” via electron doping. Finally, this may offer an unconventional way of controlling conductivity.
Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr 2 Ge 2 Te 6
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Fermi level dependent spin pumping from a magnetic insulator into a topological insulator
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Bond ordering and molecular spin-orbital fluctuations in the cluster Mott insulator GaTa 4 Se 8
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Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca 2 RuO 4
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Power Handling of Vanadium Dioxide Metal-Insulator Transition RF Limiters.
Abstract not provided.
Insulation or Irradiance: Exploring Why Bifacial Photovoltaics Run Hot
Bifacial photovoltaics are predicted to become the dominant device architecture over the next couple of years, but their thermal performance is not yet well understood. In this study, we model the thermal effects of different backside lamination materials on the performance of bifacial PERC cells. Glass-glass laminated cells were found to operate hotter than equivalent glass-polymer backsheet packed cells. This was solely due to the increased absorption of rear side incident light.
Incorporation of Al or Hf in atomic layer deposition TiO 2 for ternary dielectric gate insulation of InAlN/GaN and AlGaN/GaN metal-insulator-semiconductor-heterojunction structure
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Direct observation of an abrupt insulator to metal transition in dense liquid deuterium.
Abstract not provided.
Spin dynamics in the antiferromagnetic topological insulator MnBi4Te7
Contains python scripts used to process inelastic neutron scattering data on the spin dynamics in MnBi4Te7 at various temperatures. The nxs files are the complete data sets , the txt files contain data slices used for publication.