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The study of \emph{quantum magnetism} remains at the forefront of condensed matter physics. Spin models provide a large class of many-body systems, in which cooperative quantum phenomena can be studied in a controlled way. In addition, the \emph{neutron sc ...
A review with 111 refs. presenting exptl. aspects of metal-cluster work including: supersonic- mol.- beam technol.; laser spectroscopy; mass spectroscopy; and low- and high-temp. matrix-isolation expts. The exptl. results discussed include: stability of cl ...
We have developed an apparatus to polarize 3He gas (at a few torrs pressure) by optical pumping from a 4He light source and to measure the evolution of the magnetic moment for relaxation studies. The magnetic moment is measured by applying a pulse of radio ...
We show how the ultrasoft pseudopotentials which have recently been proposed by Vanderbilt can be implemented efficiently in the context of Car-Parrinello molecular-dynamics simulations. We address the differences with respect to the conventional norm-cons ...
This thesis reports results on magnetic properties of supported cobalt nanostructures. The nanostructures were grown on single crystal metal surface by Molecular Beam Epitaxy in an Ultra High Vacuum chamber. Our experimental setup is based on two in situ m ...
The physical and chemical properties of low-dimensional structures depend on their size and shape, and can be very different from those of bulk matter. If such structures have at least one dimension small enough that quantum-mechanical effects prevail, the ...
We have carried out an ab initio molecular dynamics simulation of liquid oxygen, a molecular fluid in which the individual 02 units carry a molecular magnetic moment. In addition to the atomic and electronic structures, our simulation describes the evoluti ...
Neutron scattering studies on powder and single crystals have provided new evidence for unconventional magnetism in Cu2Te2O5Cl2. The compound is built from tetrahedral clusters of S=1/2 Cu2+ spins located on a tetragonal lattice. Magnetic ordering, emergin ...
An Eu NMR study in the ferromagnetic phase of pure and Gd-doped EuO was performed. A complete description of the NMR line shape of pure EuO allowed for the influence of doping EuO with Gd impurities to be highlighted. The presence of a temperature-dependen ...
We present a combined experimental and theoretical investigation of shallow two-dimensional acceptor states in the presence of an external magnetic field for center-doped GaAs/AlxGa1-xAs quantum wells (QW's). The calculated 1S3/2(GAMMA6)-2S3/2(GAMMA6) tran ...