ar X iv : c on d - m at / 9 51 21 26 v 1 1 8 D ec 1 99 5 Soft X - ray Fluorescence Study of Buried Silicides in Antiferromagnetically Coupled Fe / Si Multilayers

Soft-x-ray fluorescence study of buried silicides in antiferromagnetically coupled Fe/Si multilayers.

Soft x-ray uorescence spectroscopy has been employed to obtain information about the Si-derived valence band states of Fe/Si multilayers. The valence band spectra are quite diierent for lms with and without antiferromagnetic interlayer exchange coupling, demonstrating that these multilayers have different silicide phases in their spacer layers. Comparison with previously published uorescence da...

ar X iv : c on d - m at / 9 51 21 19 v 1 1 5 D ec 1 99 5 Two Lane Traffic Simulations using Cellular Automata

We examine a simple two lane cellular automaton based upon the single lane CA introduced by Nagel and Schreckenberg. We point out important parameters defining the shape of the fundamental diagram. Moreover we investigate the importance of stochastic elements with respect to real life traffic.

ar X iv : c on d - m at / 9 51 21 60 v 1 2 2 D ec 1 99 5 Spin - reflection positivity of the Kondo lattice at half - filling

We examine the spin-reflection positivity of the ground state of the Kondo lattice model at half-filling with the antiferromagnetic and ferromagnetic exchange couplings J = 0. For every positive U > 0, where U is the Coulomb interaction between the conduction electrons, we can show that the ground state is unique.

ar X iv : h ep - l at / 9 51 20 26 v 1 2 1 D ec 1 99 5 1 Υ and J / Ψ spectroscopy using clover fermions in the presence of dynamical quarks

We calculate spin average splittings in the b ¯ b and c¯ c systems using the clover action. We compare static and kinetic masses of heavy-heavy and heavy-light mesons and discuss the consistency of the results.

ar X iv : m at h / 99 07 08 5 v 2 [ m at h . G R ] 1 7 D ec 1 99 9 LOOPS AND SEMIDIRECT PRODUCTS