Browsing Geldart, Wally by Title
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Density dependence of critical magnetic fields at the metalinsulator bifurcation in two dimensions
The density dependence of the critical inplane magnetic field Bc at the bifurcation of the resistivity of twodimensional electron systems with low levels of disorder is determined using the spinpolarization dependence ... 
Depthdependent static shielding of an impurity by a quantum plasma in a magnetic field
The static shielding of a charged impurity embedded in a quantum plasma is studied with the use of linearresponse theory. The required response function is calculated in the randomphase approximation with a uniform ... 
Diamagnetic susceptibility of a dense electron gas
The authors calculate the diamagnetic susceptibility of a uniform interacting electron gas in the randomphase approximation. From this the exact highdensity expansion of the diamagnetic susceptibility is obtained 
Dipoledipole interactions and the critical resistivity of gadolinium
Results are presented for the electrical resistivity of a caxis single crystal of highpurity gadolinium metal in the immediate vicinity of the Curie temperature. Numerical analysis reveals that the data are not well ... 
Effect of finite mean free path on spinflip scattering rates near the critical point of magnetically ordered systems
The finite electron mean free path of conduction electrons is found to play an important role in determining spinflip scattering rates, 1/sf, near a magnetic critical point. Smallmomentumtransfer processes are suppressed ... 


Exchange and correlation energy in a nonuniform fermion fluid
Recent results for the surface energy of jelliumlike surfaces are investigated within the functionaldensity formalism. These results along with firstprinciples considerations support the contention that the first gradient ... 
Exchange and Correlation Energy of an Inhomogeneous ElectronGas at Metallic Densities
No abstract available. 
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 ...