Experimental and theoretical investigations of Cr(001) surface electronic structure

Abstract

The surface electronic structure of Cr(OOl) is characterized by angle-resolved photoelectron spectroscopy. The spectral properties of surface-related photoemission features are found to be consistent with results from the first comprehensive spin-polarized calculation of Cr(OOl) surface electronic structure. The theory predicts the existence of a ferromagnetic Cr(OOl) surface phase characterized by a very large (3.00 electrons) surface spin polarization. The extensive agreement between theory ~nd experiment provides additional evidence that the Cr(OOl) surface is in fact ferromagnetic.-2--

Effect of bidimensional Fe clusters on magnetic properties of Fe/Cr superlattices

“…Using a modification of zero and poles method in order to determine a mass operator and Green functions poles, the self-consistent numerical calculations for more than 1500 nonequivalent atomic sites turned out to be performed in a reasonable computation time. Numerical results for the Fe/Cr systems obtained in the framework of PAM are in reasonable agreement with ab initio [12] and tight binding [13] approaches, and have been successfully used in the interpretation of Mo¨ssbauer experiments [14,15].…”

Surface electronic structure of Cr(001): Experiment and theory

“…It has been pointed out in Ref. 12 that the significant scattering of experimental data on Cr is caused by surface defects and contamination which influence the re ported data. Here, scanning tunneling spectroscopy (STS) can be of high value as it permits to obtain conclusive knowledge about electronic structure of perfect surfaces and of defects on an atomic scale.…”

Realistic theory of electronic correlations in nanoscopic systems

“…Thus, the first layer of the (001) surface consists of ferromagnetically aligned atoms. Intriguingly, the surface magnetic state persists up to much larger temperatures (T surf N ∼ 750-800 K) than the bulk state, as measured in references [76,77] by angular resolved photo emission (ARPES) and reference [78] by magnetization measurements with Cr particles of different diameter. This large magnetic moment originates from the altered paramagnetic electronic structure: The surface introduces massively more states close to the Fermi energy (compare Fig.…”

“…The question if correlations actually are important for the electronic structure has been subject of measurements using (inverse) photo emission spectroscopy (PES) ( [76,77,82,83]) and scanning tunneling spectroscopy (STS) [84]. These measurements all reveal a sharp peak close the Fermi energy.…”