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• W2035715610 abstract "A theory of Auger electron (AES) and appearance potential spectroscopy (APS) for interacting valence band electrons is presented. The electron system is described by the Hubbard Hamiltonian. A self-consistent moment-method is used to derive the one-electron spectrum density for arbitrary temperature T, band occupation n, and coupling strength U/W (W: Bloch band width). APS and AES are both based on the one-electron spectrum density by use of a diagrammatic vertex correction (Matsubara formalism). In weakly coupled systems the electron correlations give rise to certain deformations of the quasiparticle density of states (Q-DOS) compared to the free Bloch density of states (B-DOS). Spontaneous magnetic order, however, is excluded, irrespective of the band filling n. The AE (AP) spectra consist of only one, rather broad structure which is strongly n- but only slightly T-dependent. For strongly correlated electrons the original Bloch band splits into two quasiparticle subbands causing thereby respective splittings of the AE (AP) line shapes. In addition satellites may appear. If particle density as well as hole density exceed certain critical values, spontaneous ferromagnetism becomes possible in the strongly correlated electron system. The magnetic phase transition causes a distinct T-dependance of the Q-DOS and hence also of the AE (AP) line shapes. From integrated AE (AP) intensities one can read off the full temperature dependance of important density-density and spin-spin correlation functions." @default.
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• W2035715610 date "1992-01-01" @default.
• W2035715610 modified "2023-09-26" @default.
• W2035715610 title "Manifestation of Magnetic Phase Transitions in Auger Electron and Appearance Potential Spectra of Solids" @default.
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• W2035715610 doi "https://doi.org/10.1088/0031-8949/1992/t41/015" @default.
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