Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: The state-dependence of the enhancement of the electron-positron momentumdensity is investigated for some transition and simple metals Cr, V, Ag andAl. Quantitative comparison with linearized muffin-tin orbital calculations ofthe corresponding quantity in the first Brillouin zone is shown to yield ameasurement of the enhancement of the s, p and d states, independent of anyparameterizations in terms of the electron density local to the positron. Anempirical correction that can be applied to a first-principles state-dependentmodel is proposed that reproduces the measured state-dependence very well,yielding a general, predictive model for the enhancement of the momentumdistribution of positron annihilation measurements, including those of angularcorrelation and coincidence Doppler broadening techniques.



Author: J. Laverock, T. D. Haynes, M. A. Alam, S. B. Dugdale

Source: https://arxiv.org/







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