5,867 research outputs found
The Effect of Early Retirement Incentives on the Training Participation of Older Workers.
Human capital theory predicts that older workers are less likely to participate in on-the-job training than younger workers, due to lower net returns on such investments. Early retirement institutions are likely to affect these returns. Using the European Community Household Panel we show that older workers participate less in training, and that early retirement institutions do indeed matter. Generous early retirement schemes discourage older workers from taking part in training, whereas flexible early retirement schemes encourage this. Finally, the results suggest that in most European countries training can keep older workers longer in the labour market.
Charge profile of surface doped C60
We study the charge profile of a C60-FET (field effect transistor) as used in
the experiments of Schoen, Kloc and Batlogg. Using a tight-binding model, we
calculate the charge profile treating the Coulomb interaction in a mean-field
approximation. The charge profile behaves similarly to the case of a continuous
space-charge layer, in particular it is confined to a single interface layer
for doping higher than ~0.3 electron (or hole) per C60 molecule. The morahedral
disorder of the C60 molecules smoothens the structure in the density of states.Comment: 6 pages, 9 figure
Valence Instability and Superconductivity in Heavy Fermion Systems
Many cerium-based heavy fermion (HF) compounds have pressure-temperature
phase diagrams in which a superconducting region extends far from a magnetic
quantum critical point. In at least two compounds, CeCu2Si2 and CeCu2Ge2, an
enhancement of the superconducting transition temperature was found to coincide
with an abrupt valence change, with strong circumstantial evidence for pairing
mediated by critical valence, or charge transfer, fluctuations. This pairing
mechanism, and the valence instability, is a consequence of a f-c Coulomb
repulsion term U_fc in the hamiltonian. While some non-superconducting Ce
compounds show a clear first order valence instability, analogous to the Ce
alpha-gamma transition, we argue that a weakly first order valence transition
may be a general feature of Ce-based HF systems, and both magnetic and critical
valence fluctuations may be responsible for the superconductivity in these
systems.Comment: 11 pages, 16 figure
Didier T. Jaen sobre Daniel Balderston: \u3cem\u3eEl precursor velado: R. L. Stevenson en la obra de Borges\u3c/em\u3e
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