Zeitschrift für Physik B Condensed Matter

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Can ultrasonic sound attenuation measurements elucidate the coupling of “Heavy electrons” to the lattice?
Zeitschrift für Physik B Condensed Matter - Tập 64 - Trang 165-168 - 1986
K. D. Schotte, D. Förster, U. Schotte
An unusual peak has been found by Müller et al. for the attenuation of longitudinal sound as a function of temperature around 12 K for UPt3. Breathing mode coupling of the volume strain to the electronic energy states of a narrow band of high density at the fermi energy seems to be the origin of this peak.
Multienergetic continuous time random walk
Zeitschrift für Physik B Condensed Matter - Tập 54 - Trang 175-181 - 1984
Manuel O. Cáceres, Horacio S. Wio
We have extended the CTRW theory of Montroll and Weiss including the effect of extra variables, like the energy. This MCTRW scheme can be written in a simple matrix notation, that simplifies its solution. As an example of their usefulness we have studied a two-energy-group neutron diffusion problem. This has shown the peculiarities of the transient behaviour for the variance of the probability dis...... hiện toàn bộ
The crystal structure of the prototypic ceramic superconductor BaPbO3: An X-ray and neutron diffraction study
Zeitschrift für Physik B Condensed Matter - Tập 75 - Trang 297-302 - 1989
H. Ritter, J. Ihringer, J. K. Maichle, W. Prandl, A. Hoser, A. W. Hewat
The structure of the distorted perovskite BaPbO3 was studied with high-resolution X-ray diffraction at 300 K and 26 K and with neutron diffraction at 300 K. Simultaneous refinement of the neutron and X-ray data sets (300 K) using the Rietveld method yields a monoclinic structure with the space groupI 2/m and lattice parametersa=6.0278 (1) Å,b=6.0664(1) Å,c=8.5109(1) Å, and γ=90.083 (2)o. The tilti...... hiện toàn bộ
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
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
Mott-Hubbard transition and antiferromagnetism on the honeycomb lattice
Zeitschrift für Physik B Condensed Matter - - 1996
L. M. Martelo, Michael Dzierzawa, L. Siffert, D. Baeriswyl
Acoustic flux imaging in anisotropic media
Zeitschrift für Physik B Condensed Matter - Tập 90 - Trang 27-46 - 1993
R. L. Weaver, M. R. Hauser, J. P. Wolfe
A new method for characterizing acoustic flux propagation in anisotropic media is introduced and developed. The technique, which we call ultrasonic flux imaging (UFI), utilizes a pair of water-immersion focused acoustic transducers as a point source and point detector. Raster scanning one transducer produces a transmission pattern which exhibits the anisotropies in acoustic flux known as “phonon f...... hiện toàn bộ
Linear response and transport equations in interacting phonon systems
Zeitschrift für Physik B Condensed Matter - Tập 8 - Trang 141-166 - 1968
Rudolf Klein, Roland K. Wehner
A derivation of a transport equation for phonons, in terms of the microscopic description of an anharmonic crystal, is given. The starting point is a complete set of equations for the phonon Green function, the self-energy, and the vertex part, as given by a functional method using real times. The role of the external source field for introducing nonequilibrium into the system is discussed in deta...... hiện toàn bộ
Direct observation of magnetic fluctuations in UPt3 both above and below the superconducting transition temperature
Zeitschrift für Physik B Condensed Matter - Tập 63 - Trang 335-341 - 1986
S. M. Johnson, A. Benoit, P. J. Brown, H. Capellmann, J. Flouquet, J. J. M. Franse, P. H. Frings, K. R. A. Ziebeck
Polarised neutrons and polarisation analysis were used in a neutron scattering study of UPt3 both above the superconducting transition temperatureT c as well as below. Thus the existence of magnetic fluctuations in UPt3 was established unambiguously. For varyingQ vectors the magnetic scattering intensity was integrated over energy transfers ±20 meV to obtain a measure of the corresponding magnetic...... hiện toàn bộ
Tunneling of coupled methyl groups in lithium acetate: The isotope effect
Zeitschrift für Physik B Condensed Matter - Tập 76 - Trang 335-344 - 1989
A. Heidemann, H. Friedrich, E. Günther, W. Häusler
We studied by high resolution inelastic neutron scattering the isotope effect of tunneling of coupled methyl groups in lithium acetate dihydrate (LIAC). Fully protonated, fully deuterated and mixed LIAC samples were investigated. The results are described by a simple model in which it is assumed that the single particle potential hindering rotation is strongly increased by deuteration, whereas the...... hiện toàn bộ
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