Photoemission study of Al adlayers on Mn

Abstract

Al overlayers on Mn, studied by photoemission spectroscopy, show a large lowering of the Al 2p core-level binding energy by 0.5 eV at submonolayer (0.1 ML) coverage. The binding energy increases with coverage and reaches the bulk Al value at ≈1.3 ML. The Al 2p core-level spectrum exhibits extra components related to the different chemical environment at the interface, which decrease in intensity with increasing Al coverage. The Al related plasmon loss features appear above 1 ML. The present results are explained by a strong Al s, p-Mn 3d hybridization at the submonolayer coverage due to interface alloying, whose influence on the spectra is dominated by metallic bonding in the Al layer as coverage increases. The valence-band spectra demonstrate systematic suppression of Mn 3d-like states and emergence of a parabolic free-electron-like Al density of states

Effects of Ru substitution on electron correlations and Fermi-surface dimensionality in Ba(Fe1−xRux)Xu1, Qian2, Richard3 et al. 2012Phys. Rev. B353201View full textAdd to dashboardCite

“…4(a). The hole carriers are well compensated by the electron ones at all Ru concentrations, demonstrating that the Ru substitution is isovalent, in agreement with the core-level measurements and previous ARPES studies [8,10]. Although the carrier concentration does not change with Ru substitution, Fig.…”

“…In particular, there is a hole carrier transfer from the β band to the α band that occurs from low doping to higher doping, suggesting that the nesting conditions between the Γ-centered hole FS pockets and M-centered electron FS pockets are affected as well. Although other factors such as magnetic dilution should be taken in account [10], our experimental results thus suggest that the degradation of the nesting conditions may play a role in the suppression of the SDW ordering with Ru increasing.…”

“…However, not only previous ARPES studies did not characterized the suppression of superconductivity in the overdoped regime, the conclusions drawn on the suppression of the SDW order show a striking contrast. While Brouet et al observed a decrease in the electronic correlations and significant modifications of the Fermi surface with Ru substitution, Dhaka et al reported almost no changes in the FS topology and the band dispersions, which points towards a non-Fermi surface-driven mechanism such as magnetic dilution for the origin of the SDW suppression [10].…”

“…While it is generally believed that external pressure also changes the FS topology by modifying the chemical bonds [5], the role of isovalent element substitution is still debated. Various scenarios, for example changes of the FS topology by chemical pressure [6][7][8], the reduction of electron correlations [8,9], magnetic dilution [10], and even the addition of extra hole carriers [11], have been suggested to explain the suppression of the SDW order with isovalent element substitution in the BaFe 2 (As 1−x P x ) 2 and Ba(Fe 1−x Ru x ) 2 As 2 systems. Surprisingly, only little attention has been devoted to answer the reversed but somehow similarly important question: how does superconductivity is suppressed by increasing the substitution further than the optimal concentration?…”

Unraveling diffusion kinetics of honeycomb structured Na$_2$Ni$_2$TeO$_6$ as a high-potential and stable electrode for sodium-ion batteries

“…The peak positions are calibrated by consider the binding energy of C 1s core-level at 284.8 eV. We use Voigt function having both the Lorentzian and Gaussian broadenings for deconvolution of the core-level peaks with Tougaard background subtraction [63]. For the pristine sample, the fitted Ni 2p spectrum in Fig.…”