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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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Testing for isospin symmetry breaking by combining isotope shift measurements with precise calculations in potassium
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Isotope shifts in the 7 s → 8 s transition of francium: Measurements and comparison to ab initio theory
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Measurement and modeling of electron-cloud-induced betatron tune shifts at the Cornell Electron-Positron Storage Ring test accelerator
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Simultaneous beam-based alignment measurement for multiple magnets by correcting induced orbit shift
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Density distributions of tune shifts from space charge or beam-beam interactions in Gaussian bunches
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Stripes and the emergence of charge π -phase shifts in isotropically paired systems
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Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi
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Nonrigid band shift and nonmonotonic electronic structure changes upon doping in the normal state of the pnictide high-temperature superconductor Ba ( F e 1 - x C o x ) 2 A s 2
Here, we report systematic angle-resolved photoemission (ARPES) experiments using different photon polarizations and experimental geometries and find that the doping evolution of the normal state of Ba(Fe 1–x Co x ) 2 As 2 deviates significantly from the predictions of a rigid band model. The data reveal a nonmonotonic dependence upon doping of key quantities such as band filling, bandwidth of the electron pocket, and quasiparticle coherence. Our analysis suggests that the observed phenomenology and the inapplicability of the rigid band model in Co-doped Ba122 are due to electronic correlations, and not to the either the strength of the impurity potential, or self-energy effects due to impurity scattering. Our findings indicate that the effects of doping in pnictides are much more complicated than currently believed. More generally, they indicate that a deep understanding of the evolution of the electronic properties of the normal state, which requires an understanding of the doping process, remains elusive even for the 122 iron-pnictides, which are viewed as the least correlated of the high-T C unconventional superconductors.
DFT investigation of the effect of spin-orbit coupling on the NMR shifts in paramagnetic solids
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Superconducting order parameter π -phase shift in magnetic impurity wires
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Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials
The plastic deformation of crystalline materials is usually modeled as smoothly progressing in space and time, yet modern studies show intermittency in the deformation dynamics of single-crystals arising from avalanche behavior of dislocation ensembles under uniform applied loads. However, once the prism of the microstructure in polycrystalline materials disperses and redistributes the load on a grain-by-grain basis, additional length and time scales are involved. Thus, the question is open as to how deformation intermittency manifests for the nonuniform grain-scale internal driving forces interacting with the finer-scale dislocation ensemble behavior. In this work we track the evolution of elastic strain within individual grains of a creep-loaded titanium alloy, revealing widely varying internal strains that fluctuate over time. Here, the findings provide direct evidence of how flow intermittency proceeds for an aggregate of ~700 grains while showing the influences of multiscale ensemble interactions and opening new avenues for advancing plasticity modeling.
Nuclear moments and isotope shifts of the actinide isotopes Cf 249 – 253 probed by laser spectroscopy
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Level lifetimes in P 32 obtained using the Doppler-shift attenuation method with thick molecular targets
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