Geldart, Wally
Wally Geldart
Professor (Research)FRSC
Email: geldart@fizz.phys.dal.ca
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Analytical structure of the wavenumberdependent susceptibility of manyfermion systems at low temperature and long wavelength. II
For pt.I see ibid., vol.15, p.1523 (1977). It is shown that the nonanalytic structure of the wavenumberdependent susceptibility noted by Geldart and Rasolt is not removed by including repeated particleparticle scattering 
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 ... 
Contribution of water vapor dimers to clear sky absorption of solar radiation
Using previously derivedvalues of the water vapor dimer spectral absorption cross section we calculate the water vapor dimer contribution to the clear sky absorption of solar radiation. We consider the water dimer ... 
Twocomponent scaling near the metalinsulator bifurcation in two dimensions
We consider a twocomponent scaling picture for the resistivity of twodimensional (2D) weakly disordered interacting electron systems at low temperature with the aim of describing both the vicinity of the bifurcation and ... 
Temperature dependent resistivity in the lowresistance region for diffusive transport in two dimensions
The interpretation of the metalinsulator transition phenomena in disordered twodimensional electron systems in terms of densitydependent scaling variables suggests the existence of a quantum critical point at some ... 
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 ... 
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 ... 
Anisotropy of the critical magnetic susceptibility of gadolinium
The magnetic susceptibility along the c axis (xc) and in the basal plane (xb) has been measured on a single crystal of Gd in the reduced temperature range 4104t1.3102. Uniaxial anisotropy is observed. Magnetic dipoledipole ... 
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 ... 
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 ... 
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 ... 
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 ... 
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 ... 
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), ... 
Anharmonicity and cross section for absorption of radiation by water dimer
We calculate the absorption cross section of water dimer molecules in thermal equilibrium at temperatures typical of the lower atmosphere using quantum mechanical coupled nonlinear equations of motion. Empirical Morseoscillator ... 

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 ...