Zeitschrift für Physik B Condensed Matter

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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.
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
Critical dynamics and stability of elastically coupled systems at marginal dimensionalities
Zeitschrift für Physik B Condensed Matter - Tập 39 - Trang 163-172 - 1980
G. Meissner, R. Pirc
Static and dynamic behavior of an-component classical model atd=4 has been investigated assuming a coupling to a fluctuating lattice displacement field. Solutions of renormalization-group (RG) equations are given for elastically isotropic and anisotropic systems, and the temperature dependences of elastic constants and of the corresponding damping coefficients are calculated. For isotropic and wea...... hiện toàn bộ
Kinetics of particle coarsening processes
Zeitschrift für Physik B Condensed Matter - Tập 94 - Trang 353-358 - 1994
K. G. Wang, X. S. Xing, X. F. Wu, F. W. Zhu, T. Ko
A nonequilibrium statistical mechanical theory for particle coarsening processes is presented. In this theory, the rate of change of a given particle is determined by both a deterministic and a fluctuation terms, and the particle size distribution (PSD) satisfies Fokker-Planck-type equation. We use a time scaling technique and find the PSD scaled by average particle size as well as the power laws ...... hiện toàn bộ
Low temperature magnetic structure of erbium iron garnet
Zeitschrift für Physik B Condensed Matter - Tập 82 - Trang 283-294 - 1991
Rainer Hock, Hartmut Fuess, Thomas Vogt, Michel Bonnet
The magnetic and crystallographic structure of erbium iron garnet {Er3}[Fe2](Fe3)O12 has been refined simultaneously from powder and single crystal neutron diffraction data. At 5 K the ferrimagnetic structure has a spin direction parallel to [100]. Magnetic moments of iron and erbium and canting angles for the erbium sublattices were derived in space groupI41/acd for 5 K... hiện toàn bộ
Spin-correlations and low lying excited states of the spin-1/2 Heisenberg antiferromagnet on a square lattice
Zeitschrift für Physik B Condensed Matter - Tập 72 Số 2 - Trang 181-193 - 1988
Peter Horsch, Wolfgang von der Linden
Van der Waals attraction between cylinders, rods or fibers
Zeitschrift für Physik B Condensed Matter - Tập 15 - Trang 61-86 - 1972
D. Langbein
In a first step, we calculate the van der Waals energy between two cylinders by pairwise integration of unscreenedr −6 interactions between any two molecules. It turns out proportional tod −3/2 at small separations and proportional tod −5 at large separationsd of the cylinders. In a second step, we use an integration method for multiplet interactions, which relates the latter to screening and repr...... hiện toàn bộ
Effect of O-O transfer upon a hole in CuO2 planes of HTS
Zeitschrift für Physik B Condensed Matter - Tập 104 - Trang 433-438 - 2014
A. Shelkan, G. Zavt, V. Hizhnyakov, E. Sigmund
The formation of spin polarons (spin-polarized clusters) in the weakly doped antiferromagnetically ordered CuO2 planes of high-T c cuprates is investigated. The influence of additional holes is calculated within a self-consistent mean-field approximation, by taking O-O hybridization (characterized by the parameter t) into account. It is shown that the binding energy and the polariz...... hiện toàn bộ
The Debye-Waller factor and the diffusion process for hydrogen in Nb, Ta, and V single crystals investigated by neutron spectroscopy
Zeitschrift für Physik B Condensed Matter - Tập 32 - Trang 157-165 - 1979
V. Lottner, A. Heim, T. Springer
Quasielastic scattering of slow neutrons on hydrogen diffusing in theα-phase of NbH0.02, TaH0.13 and VH0.07 single crystals was investigated in a wide range of temperatures and scattering vectorsQ (0.5≦Q≦2.5 Å−1). The incoherent scattering lawS d (Q,ω) for four different diffusion models was consistently compared with the measured lineshapes. At elevated temperat...... hiện toàn bộ
Instability in a chemical network system as a model of reaction cascades
Zeitschrift für Physik B Condensed Matter - Tập 81 - Trang 441-444 - 1990
Kotaro Shirane, Osamu Tanimoto, Yoshiko Yamaguchi
A chemical network system for use in the study of reaction cascades is described by the nonlinear rate equation $$\dot x = \varphi \left( x \right) \simeq - k_1 x - k_2 x^3 $$ , in which ϕ(x) is derived from the −∂G/∂x of Taylor's expansion of the order parameterx of the thermodynamic potential, Gibbs' ...... hiện toàn bộ
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