Browsing Geldart, Wally by Title
Now showing items 1433 of 57

Convergence properties as a function of spatial dimensionality of gradient expansions for the groundstate energy of an inhomogeneous electron gas
The extended ThomasFermi approximation for the groundstate energy of a manyfermion system is generalized to arbitrary spatial dimension. The authors' objective is a better understanding of convergence properties of such ... 
Critical behavior of twodimensional magnetic systems with dipoledipole interactions
The critical exponents of twodimensional dipolar magnetic systems with isotropic inplane ordering may be obtained from the expansion which determines the exponents of isotropic threedimensional dipolar systems. However, ... 
Critical exponents and amplitude ratios from electrical resistivity measurements of dysprosium
Resistive anomalies in helical antiferromagnets are shown to reflect the temperature dependence of the specific heat sufficiently close to the Neel temperature. The temperature dependence of superzone energy gaps does not ... 

Critical magnetic susceptibility of gadolinium
The magnetic suspectibility of a single crystal of highpurity gadolinium has been measured in the critical region with use of AC susceptibility methods. For reduced temperatures t103, the data are described by a simple ... 

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), ...