49 research outputs found
Unified Behavior of Alkali Core-Level Binding-Energy Shifts Induced by sp Metals
Thin overlayers of Na, K, Rb, and Cs on different sp-metal substrates have been investigated using photoelectron spectroscopy. The alkali core levels show clearly resolved binding-energy shifts between the surface layer, the intermediate layer(s), and the interface layer. The magnitude of these shifts depends on sp metal and on alkali metal. The layer-resolved core-level binding-energy shifts are well reproduced by models based on a thermodynamical description. For three-layer alkali films the core-level binding energy of the intermediate layer is found to exhibit a small but significant shift between different sp-metal substrates. A simple relationship between the core-level binding-energy shift for the interface layer and the difference in rs value between the sp substrate and the adsorbate is shown to exist
Doping Dependence of the Electronic Structure of Ba_{1-x}K_{x}BiO_{3} Studied by X-Ray Absorption Spectroscopy
We have performed x-ray absorption spectroscopy (XAS) and x-ray photoemission
spectroscopy (XPS) studies of single crystal Ba_{1-x}K_{x}BiO_{3} (BKBO)
covering the whole composition range . Several features in
the oxygen 1\textit{s} core XAS spectra show systematic changes with .
Spectral weight around the absorption threshold increases with hole doping and
shows a finite jump between and 0.40, which signals the
metal-insulator transition. We have compared the obtained results with
band-structure calculations. Comparison with the XAS results of
BaPb_{1-x}Bi_{x}O_{3} has revealed quite different doping dependences between
BKBO and BPBO. We have also observed systematic core-level shifts in the XPS
spectra as well as in the XAS threshold as functions of , which can be
attributed to a chemical potential shift accompanying the hole doping. The
observed chemical potential shift is found to be slower than that predicted by
the rigid band model based on the band-structure calculations.Comment: 8 pages, 8 figures include
The irreversibility line of overdoped Bi_{2+x}Sr_{2-(x+y)}Cu_{1+y}O_{6 +- delta} at ultra-low temperatures and high magnetic fields
The irreversible magnetization of the layered high-T_{c} superconductor
Bi_{2+x}Sr_{2-(x+y)}Cu_{1+y}O_{6 +- delta} (Bi-2201) has been measured by means
of a capacitive torquemeter up to B=28 T and down to T=60 mK. No magnetization
jumps, peak effects or crossovers between different pinning mechanisms appear
to be present. The deduced irreversibility field B_{irr} can not be described
by the law B_{irr}(T)=B_{irr}(0)(1-T/T_{c})^n based on flux creep, but an
excellent agreement is found with the analytical form of the melting line of
the flux lattice as calculated from the Lindemann criterion. The behavior of
B_{irr}(T) obtained here is very similar to the resistive critical field of a
Bi-2201 thin film, suggesting that magnetoresistive experiments are likely to
be strongly influenced by flux lattice melting.Comment: 4 pages, 4 eps figure
Changes in the local surface geometry with conserved adsorbate coverage and long-range order caused by annealing
The ordered c(2×2) Na on Al(100) and (3 × 3) R30°K on Al(111) structures formed at either 100 K or at room temperature are studied by high-resolution core-level spectroscopy. For both systems equal alkali coverages are found at these two temperatures. The core-level spectra, however, show strong changes with temperature. This behavior leads to the surprising conclusion that annealing at room temperature causes an irreversible change in the local geometry, i.e., of the adsorption site, of the overlayer even though neither the long-range order nor the adsorbate coverage changes
Layer dependent core level binding energy shifts : Na, K, Rb and Cs on Al(111)
Layer resolved core level spectra are presented for Na, K, Rb and Cs films on Al(111). From the development of the spectra, it is possible to distinguish emission from alkali atoms at the interface, in the bulk, and at the surface of the adsorbed layers. The core level binding energy shifts are discussed in terms of adhesion and interface segregation energies. It is found experimentally that the Al induced core level binding energy shifts of the alkalis are increasing with increasing atomic number of the alkali metal. This trend is qualitatively reproduced by semi-empirical calculations