Zeitschrift für Physik B Condensed Matter

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The two dimensional antiferromagnetic Heisenberg model in the presence of an external field
Zeitschrift für Physik B Condensed Matter - Tập 104 - Trang 117-123 - 2014
M. S. Yang, K. H. Mütter
We present numerical results on the zero temperature magnetization curve and the static structure factors of the two dimensional antiferromagnetic Heisenberg model in the presence of an external field. The impact of frustration is also studied.
Liquid-like structure of vapour quenched SnAu- and SnCu-films
Zeitschrift für Physik B Condensed Matter - - 1980
H. Leitz
SnAu- and SnCu-alloys are vapour quenched at cryogenic temperatures. Resistivity and electron diffraction patterns were recorded in situ. The scattered intensities have been normalized to interference functions. The overall agreement with those of the corresponding liquid systems is quite well. The average interatomic distances obtained from the atomic distribution functions show a concentration d...... hiện toàn bộ
Dynamic structure factor of ideal quantum systems
Zeitschrift für Physik B Condensed Matter - Tập 12 - Trang 287-291 - 1971
K. Baerwinkel
The dynamic structure factor of ideal Bose and Fermi systems is represented by means of an elementary function. This representation is valid for any temperature.
Quasi-ballistic evolution of a quantum particle in a random potential with arbitrary correlation time
Zeitschrift für Physik B Condensed Matter - Tập 90 - Trang 117-123 - 1993
J. Heinrichs
The evolution of the mean kinetic energy and of the mean square displacement of a quantum particle in a time-dependent random potential is studied by perturbation theory in the near ballistic regime. Convenient general formulas are derived for an arbitrary correlation time, τ, of the disorder. These formulas are studied analytically near the limit of perfect dynamic disorder (τ=0) and for static d...... hiện toàn bộ
Magnetic relaxation spectra of YbPd2Si2
Zeitschrift für Physik B Condensed Matter - Tập 76 - Trang 229-233 - 1989
W. Weber, E. Holland-Moritz, A. P. Murani
We present the results of inelastic neutron scattering experiments on the intermediate-valent system YbPd2Si2 to investigate the magnetic relaxation behaviour. We have performed measurements on polycrystalline samples with neutrons of incident energyE 0=3.1 meV at temperatures between 1.5 K and 250 K, and withE 0=12.7 meV andE 0=50.8 meV at temperatures between 5 K and 50 K using time-of-flight sp...... hiện toàn bộ
Non-linear effects in the study of structural phase transitions by birefringence measurements
Zeitschrift für Physik B Condensed Matter - Tập 77 - Trang 431-437 - 1989
G. Hess
Birefringence measurements do not necessarily reveal the temperature dependence of the order parameter in structural phase transitions. Even in simple systems and even at temperatures very close to the transition, deviations from a linear relation between the morphic birefringence and the order parameter may be found. The linear parts of the contributions to the birefringence, resulting from diffe...... hiện toàn bộ
Surface plasmon dispersion for very small metallic spheres: A quantum mechanical formulation
Zeitschrift für Physik B Condensed Matter - Tập 27 - Trang 75-79 - 1977
Basab B. Dasgupta
We have derived a pair of matrix equations describing the surface plasmon dispersion for a very small spherical metal particle, using the quantum mechanical random-phase approximation (RPA). The surface of the sphere is represented by an infinite spherical potential well for the conduction electrons and the positive ions are assumed to be uniformly distributed into a “jellium”. The dispersion rela...... hiện toàn bộ
On the structural stability of metallic glasses
Zeitschrift für Physik B Condensed Matter - Tập 45 - Trang 307-313 - 1982
S. M. Mujibur Rahman
We discuss the various possibilities advanced to account for the structural stability of metallic glasses. Using a formalism based on the pseudopotential theory and the Gibbs-Bogoliubov inequality we calculate the free energies and free energies of formation for the glassy phase of MgCa at various concentrations and compare these results with those for the corresponding solid and liquid phases of ...... hiện toàn bộ
Properties of the glass instability treated within a mode coupling theory
Zeitschrift für Physik B Condensed Matter - Tập 60 - Trang 195-203 - 1985
W. Götze
The anomalies at the liquid glass transition discussed recently by Bengtzelius et al. within a mode coupling theory are demonstrated to be due to an isolated eigenvalue of a certain stability matrix to approach unity at the critical point. Within this scenario it is shown how to derive the asymptotic results for the correlations functions analytically up to the determination of two eigenvectors an...... hiện toàn bộ
Crystal-field splitting and temperature dependence of two-dimensional antiferromagnetism in the high-Tc compound DyBa2Cu4O8
Zeitschrift für Physik B Condensed Matter - Tập 91 - Trang 149-153 - 1993
B. Roessli, P. Fischer, M. Zolliker, P. Allenspach, J. Mesot, U. Staub, A. Furrer, E. Kaldis, B. Bucher, J. Karpinski, E. Jilek, H. Mutka
By means of a quantitative analysis of extensive elastic neutron scattering experiments performed on theT c =78 K superconductor DyBa2Cu4O8 it is shown that two-dimensional (2D) antiferromagnetic Dy ordering in the (a,b)-plane remains stable in the whole temperature range fromT N =(1.10±0.02) K down to 7 mK. The magnetic differe...... hiện toàn bộ
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