Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids

Abstract

The state-dependence of the enhancement of the electron-positron momentum density is investigated for some transition and simple metals (Cr, V, Ag and Al). Quantitative comparison with linearized muffin-tin orbital calculations of the corresponding quantity in the first Brillouin zone is shown to yield a measurement of the enhancement of the s, p and d states, independent of any parameterizations in terms of the electron density local to the positron. An empirical correction that can be applied to a first-principles state-dependent model is proposed that reproduces the measured state-dependence very well, yielding a general, predictive model for the enhancement of the momentum distribution of positron annihilation measurements, including those of angular correlation and coincidence Doppler broadening techniques.

References in corpus (4)

• Modeling the momentum distributions of annihilating electron-positron pairs in solids
• Bulk electronic structure of optimally doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Bulk Spin Polarization of Co${}_{(1-x)}$Fe${}_x$S${}_2$
• Fermi Surface of Cr${}_{1-x}$V${}_x$ across the Quantum Critical Point

Cited by in corpus (15)

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• Gradient correction scheme for bulk and defect positron states in materials: New developments
• Magnons in antiferromagnetic bcc-Cr and Cr${}_2$O${}_3$ from time-dependent density functional theory
• Enhancement models of momentum densities of annihilating electron-positron pairs: the many-body picture of natural geminals
• Electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation
• Fermi surface of an important nano-sized metastable phase: Al${}_3$Li
• Nature of the positron state in CdSe quantum dots
• Photoemission spectroscopy using virtual photons emitted by positron sticking: a new probe of the top layer surface electronic structure
• Spin Dynamics and Resonant Inelastic X-ray Scattering in Chromium with Commensurate Spin-Density Wave Order
• Fermi-Surface Modeling of Light-Rare-Earth Hexaborides with 2D-ACAR Spectroscopy
• An investigation of the sensitivity of the Fermi surface to the treatment of exchange and correlation
• Fermi surface determination from momentum density projections
• First measurements with the Munich 2D-ACAR spectrometer on Cr