Journal ArticleDOI
Antiferromagnetic-spin-flop critical field in MnxZn1-xF2
Reads0
Chats0
TLDR
In this paper, the antiferromagnetic spin-flop critical field Hc(x) was calculated on the basis of known exchange and anisotropy parameters of the MnF2 system.Abstract:
The antiferromagnetic resonance in MnxZn1-xF2, measured recently by Wiltshire (1977), gives information about the antiferromagnetic-spin-flop critical field Hc(x). The authors calculate Hc(x) on the basis of known exchange and anisotropy parameters of the MnF2 system. The concentration dependence of the anisotropy is determined through a separation between short-range and long-range parts of the dipolar forces while the Mn-Mn exchange interactions are assumed to be unaffected by the zinc dilution. The theoretical treatment is based on an extension of the Izyumov type of perturbation theory (1966) to non-magnetic impurity problems. Coherent potential approximation (CPA) analyses are also carried out. Results are in reasonable agreement with experiment.read more
Citations
More filters
Journal ArticleDOI
Dynamics of supercooled liquids and the glass transition
TL;DR: In this article, closed nonlinear equations are derived for a self-consistent treatment of density propagation, self-diffusion and current relaxation in a classical monatomic fluid, and a simplified model is analyzed in detail.
Journal ArticleDOI
Kinetic theory of self-motion in monatomic liquids
L Sjogren,A Sjolander +1 more
TL;DR: In this paper, a theory for the memory function of the velocity autocorrelation function for a monatomic liquid is presented, based on a general kinetic approach, and strong emphasis is put on the coupling of the motion of a single particle to the collective motions in its surrounding.
Journal ArticleDOI
Ab initio density functional studies of transition-metal sulphides: II. Electronic structure
TL;DR: In this paper, the electronic structure of transition-metal sulfides of various stoichiometries and crystal structures has been investigated and a correlation between the catalytic activity and the characters of the highest occupied states (the frontier orbitals) was suggested.
Journal ArticleDOI
Detailed electrical characterisation of the deep Cr acceptor in GaAs
Abstract: DLTS and ODLTS measurements in p-type and n-type LPE GaAs have been used to characterise the deep Cr acceptor level. Both its electron and hole emission rates have been determined separately. Together with previous determination of electron and hole capture cross sections, these measurements lead to a coherent description of the deep Cr level, which is shown to correspond to the Cr3+ or Cr2+ states according to its electronic filling. The Fermi function of the level has been deduced from these experimental results without any approximation. Furthermore, it is shown that the concentration of the Cr level can be determined not only in p-type GaAs, but also in n-type material from ODLTS measurements using only a Schottky diode. Comparison with results of chemical analysis allows us to conclude that most, if not all, the Cr atoms are electrically active in GaAs.
Journal ArticleDOI
An examination of the formation and characteristics of charge-density waves in inorganic materials with special reference to the two- and one-dimensional transition-metal chalcogenides
R L Withers,John A. Wilson +1 more
TL;DR: In this paper, the authors provide a relatively brief outline of the current situation regarding the formation and properties of charge density wave states in low-dimensional transition metal compounds, and illustrate the types of problem involved by specifically focusing on 1T- and 2H-TaS2 and TaSe2, VSe 2, NbSe3 and NbTe4.
References
More filters
Journal ArticleDOI
Experiments on simple magnetic model systems
L.J. de Jongh,A.R. Miedema +1 more
TL;DR: In this article, a review of the theoretical and experimental results obtained on simple magnetic model systems on magnetic lattices of dimensionality 1, 2, and 3 is presented, with particular attention paid to the approximation of these model systems in real crystals, viz how they can be realized or be expected to exist in nature.
Journal ArticleDOI
Spatially Random Heisenberg Spins at Very Low Temperatures. I. Dilute Ferromagnet
Journal ArticleDOI
Neutron inelastic scattering measurements of antiferromagnetic excitations in MnF2 at 4.2°K and at temperatures up to the neel point
TL;DR: In this paper, the antiferromagnetic properties of MnF/sub 2/ were studied using a twin-rotor neutron time-of-flight spectrometer, and spin wave dispersion relations were obtained for propagation in the (100) and (001) directions at 4.2 and 4.3 deg K, respectively.
Journal ArticleDOI
Anisotropy in the Antiferromagnetic Mn F 2
TL;DR: The major part of the anisotropy in the paramagnetic susceptibility of Mn${\mathrm{F}}_{2}$ above the Curie point, as measured by Stout and Griffel, can be accounted for by magnetic dipole interactions.
Journal ArticleDOI
Spin-Flopping in MnF2 by High Magnetic Fields
TL;DR: In this article, the critical field for spin-flopping given by the combination of anisotropy and exchange, (2HEHA)12 is found to be 93±2 koe in excellent agreement with resonance results of S. Foner and A. H. Nethercot.