Browsing Geldart, Wally by Title
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Fourthorder gradient contributions in extended ThomasFermi theory for noninteracting fermions at finite temperature
Nonlocal corrections to the free energy of a system of noninteracting fermions are considered within the framework of extended ThomasFermi theory. The density and temperature dependence of gradient corrections is given ... 
Gradient corrections in the exchange and correlation energy of an inhomogeneous electron gas
A closed form expression for the coefficient Bxc which determines the first gradient corrections to the exchange and correction energy is derived. The exact expression is obtained from an approximation that includes the ... 
Heat capacity of gadolinium near the Curie temperature
Highresolution AC calorimetric data near the Curie point are reported for several single crystals of gadolinium. The critical temperature and the shape of the heatcapacity curve near Tc both depend on the samplepreparation ... 

Influence of the envelope function on the groundstate energy of quasitwodimensional Wigner solids
At sufficiently low density, quasitwodimensional electron systems in their ground state form Wigner solids. In previous studies of the groundstate energy of such systems (in the absence of an applied magnetic field), ... 
Lattice sums for dipolar systems
A general method for the evaluation of lattice sums determining the effective parameters in the Hamiltonian of a dipolar magnetic system is described. The anisotropy of the Hamiltonian is examined for crystal structures ... 
Linearresponse function of a semiinfinite degenerate plasma in the presence of an external magnetic field
The static linearresponse function x0(r,r') of a semiinfinite, degenerate plasma of noninteracting electrons is calculated in the presence of an external magnetic field perpendicular to the surface. The surface is simulated ... 
Magnetic susceptibility of metallic transitionmetal dichalcogenides
A tightbinding model has been used to estimate the anisotropy of the magnetic susceptibility of the metallic transitionmetal dichalcogenides. The calculated anisotropies obtained are in qualitative agreement with ... 
Motion of a point dipole in an infinite hole through a superconductor
The authors consider the system of a magnetic point dipole placed in an infinite square hole through a superconductor. Using the method of images they obtain the potential and the field distribution in the hollow. Using ... 
Negative electronelectron drag between narrow quantum Hall channels
Momentum transfer due to Coulomb interaction between two parallel, twodimensional, narrow, and spatially separated layers, when a current Idrive is driven through one layer, is studied in the presence of a perpendicular ... 
Nonlocal exchange energy of manyfermion systems of arbitrary dimensionality and interparticle interaction
The exchange contributions to the groundstate energy of an inhomogeneous manyfermion system of arbitrary dimensionality are calculated. Explicit results are given for both the localdensity approximation and the lowestorder ... 
Photoacoustic investigation of the temperature and magneticfield dependence of the specificheat capacity and thermal conductivity near the Curie point of gadolinium
The photoacoustic technique was used as a simple but accurate tool to simultaneously determine the specificheat capacity C and thermal conductivity K of gadolinium in the neighborhood of the Curie point. One polycrystalline ... 
Plasmons in disordered, twocomponent, quasitwodimensional electron systems
The authors investigate the effect of elastic scattering of electrons on the properties of plasmons in a disordered, twocomponent, quasitwodimensional electron gas. Numerical results are given for dispersion relations ... 
Quantum critical behavior in the insulating region of the twodimensional metalinsulator transition
We show that the quantum critical point associated with the metalinsulator transition phenomenon in two dimensions controls an extended critical region encompassing not only the usual quantum critical sector but also a ... 
Resistive anomalies at the critical point of isotropic ferromagnets
The effect of spin fluctuations on electrical resistivity (T) is studied in a singleband model. It is shown that d(T)/dT varies as the magnetic specific heat for TTc as well as TTc and that both shortrange and longrange ... 
Shortdistance expansion for the spinspin correlation function of uniaxial dipolar systems
Motivated by recent work on the critical resistivity of gadolinium, a detailed study has been made of the temperature dependence of the twopoint vertex function in the largemomentum regime. The operatorproject expansion ... 
Small and large wavelength contributions to the exchange and correlation energy of a nonuniform electron gas
For the uniform electron gas, the decomposition of the exchange and correlation energy into its individual wave vectors has proved invaluable for both a deeper understanding of its structure as well as its extensions to ... 
Spin correlations in the lowdensity electron system
The authors have calculated the spin susceptibility x(q,) within a microscopic model over the full range of densities of the electron liquid in the paramagnetic state. Electronelectron interactions are described by static ... 
Surfaceinduced quantum density oscillations in the presence of an external magnetic field
The electron number density and spin density near the surface of a model metal, semimetal, or semiconductor are calculated in the presence of a uniform magnetic field. The magnetic field is applied in a direction perpendicular ...