Magnetic order in the quasi-two-dimensional easy-planeXXZmodel

Two-dimensional magnetic order in Pb2Sr,TbCu308

Neutron diffraction techniques have been used to investigate the magnetic ordering of the Tb ions in polycrystalline PbpSr,TbCu,Os. Significant magnetic correlations are found to develop below -10 K, and these correlations are two dimensional in nature, representative of the strongly anisotropic magnetic interactions in these layered materials. The correlation length increases with decreasing t...

Bulk magnetic order in a two dimensional

Prof. Viktor V. Poltavets Department of Chemistry and Chemical Biology, Rutgers University Piscataway, NJ 08854 (USA) and Department of Chemistry, Michigan State University, East Lansing, MI 48824 (USA) Dr. Konstantin A. Lokshin, Prof. Takeshi Egami Department of Materials Science and Engineering, University of Tennessee Knoxville, TN 37996 (USA) Dr. Andriy H. Nevidomskyy, Prof. Mark Croft, Pro...

Magnetic phases of the quasi-two-dimensional compounds FexCo1 - xTa2O6.

We report new results on the magnetic properties of the FexCo1 - xTa2O6 series of compounds. Essentially using neutron-diffraction and magnetic measurements we study, in more detail, the low-x limit of the temperature versus x phase diagram, where a new bicritical point is observed. The complete phase diagram shows three different magnetic phases at low temperature, for a high, intermediate and...

Quasi-two-dimensional excitons in finite magnetic fields

We present a theoretical and experimental investigation of the effects of a magnetic field on quasi-twodimensional excitons. We calculate the internal structures and dispersion relations of spatially direct and indirect excitons in single and coupled quantum wells in a magnetic field perpendicular to the well plane. We find a sharp transition from a hydrogenlike exciton to a magnetoexciton with...

Magnetic quantum oscillations in quasi-two-dimensional metals