Browsing Geldart, Wally by Title

Now showing items 20-39 of 57

  • Density dependence of critical magnetic fields at the metal-insulator bifurcation in two dimensions 

    Geldart, D. J. W., and D. Neilson. 2003. "Density dependence of critical magnetic fields at the metal-insulator bifurcation in two dimensions." Physical Review B (Condensed Matter and Materials Physics) 67(4): 45310-1. Copyright © 2003 American Physical Society.
    The density dependence of the critical in-plane magnetic field Bc at the bifurcation of the resistivity of two-dimensional electron systems with low levels of disorder is determined using the spin-polarization dependence ...

  • Depth-dependent static shielding of an impurity by a quantum plasma in a magnetic field 

    Gumbs, G., and D. J. W. Geldart. 1984. "Depth-dependent static shielding of an impurity by a quantum plasma in a magnetic field." Physical Review B (Condensed Matter) 29(10): 5445-57. Copyright © 1984 American Physical Society.
    The static shielding of a charged impurity embedded in a quantum plasma is studied with the use of linear-response theory. The required response function is calculated in the random-phase approximation with a uniform ...

  • Diamagnetic susceptibility of a dense electron gas 

    Vignale, G., M. Rosolt, and D. J. W. Geldart. 1988. "Diamagnetic susceptibility of a dense electron gas." Physical Review B (Condensed Matter) 37(5): 2502-7. Copyright © 1988 American Physical Society.
    The authors calculate the diamagnetic susceptibility of a uniform interacting electron gas in the random-phase approximation. From this the exact high-density expansion of the diamagnetic susceptibility is obtained

  • Dipole-dipole interactions and the critical resistivity of gadolinium 

    Geldart, D. J. W., K. De'Bell, J. Cook, and M. J. Laubitz. 1987. "Dipole-dipole interactions and the critical resistivity of gadolinium." Physical Review B (Condensed Matter) 35(16): 8876-9. Copyright © 1987 American Physical Society.
    Results are presented for the electrical resistivity of a c-axis single crystal of high-purity 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 spin-flip scattering rates near the critical point of magnetically ordered systems 

    Geldart, D. J. W., and K. De'Bell. 1985. "Effect of finite mean free path on spin-flip scattering rates near the critical point of magnetically ordered systems." Physical Review B (Condensed Matter) 32(5): 3285-8. Copyright © 1985 American Physical Society.
    The finite electron mean free path of conduction electrons is found to play an important role in determining spin-flip scattering rates, 1/sf, near a magnetic critical point. Small-momentum-transfer processes are suppressed ...

  • Electron-Distribution Around a Magnetic Impurity in a Nonmagnetic Host 

    JENA, P., and DJW GELDART. 1973. "Electron-Distribution Around a Magnetic Impurity in a Nonmagnetic Host." Physical Review B 7(1): 439-450. Copyright © 1973 American Physical Society.
    No abstract available.

  • Exact Electron-Gas Response Functions at High-Density - Comment 

    RASOLT, M., and DJW GELDART. 1988. "Exact Electron-Gas Response Functions at High-Density - Comment." Physical Review Letters 60(19): 1983-1983. Copyright © 1988 American Physical Society.
    No abstract available.

  • Exchange and correlation energy in a nonuniform fermion fluid 

    Rasolt, M., and D. J. W. Geldart. 1986. "Exchange and correlation energy in a nonuniform fermion fluid." Physical Review B (Condensed Matter) 34(2): 1325-8. Copyright © 1986 American Physical Society.
    Recent results for the surface energy of jelliumlike surfaces are investigated within the functional-density formalism. These results along with first-principles considerations support the contention that the first gradient ...

  • Exchange and Correlation Energy of an Inhomogeneous Electron-Gas at Metallic Densities 

    GELDART, DJW, and M. RASOLT. 1976. "Exchange and Correlation Energy of an Inhomogeneous Electron-Gas at Metallic Densities." Physical Review B 13(4): 1477-1488. Copyright © 1976 American Physical Society.
    No abstract available.

  • Fourth-order gradient contributions in extended Thomas-Fermi theory for noninteracting fermions at finite temperature 

    Geldart, D. J. W., and E. Sommer. 1985. "Fourth-order gradient contributions in extended Thomas-Fermi theory for noninteracting fermions at finite temperature." Physical Review B (Condensed Matter) 32(12): 7694-702. Copyright © 1985 American Physical Society.
    Nonlocal corrections to the free energy of a system of noninteracting fermions are considered within the framework of extended Thomas-Fermi theory. The density and temperature dependence of gradient corrections is given ...

  • Gradient corrections in the exchange and correlation energy of an inhomogeneous electron gas 

    Rasolt, M., and D. J. W. Geldart. 1975. "Gradient corrections in the exchange and correlation energy of an inhomogeneous electron gas." Physical Review Letters 35(18): 1234-7. Copyright © 1975 American Physical Society.
    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 

    Bednarz, G., D. J. W. Geldart, and M. A. White. 1993. "Heat capacity of gadolinium near the Curie temperature." Physical Review B (Condensed Matter) 47(21): 14247-59. Copyright © 1993 American Physical Society.
    High-resolution AC calorimetric data near the Curie point are reported for several single crystals of gadolinium. The critical temperature and the shape of the heat-capacity curve near Tc both depend on the sample-preparation ...

  • Indirect-Exchange Interactions in Disordered Metals at Finite Temperature 

    SHEGELSKI, MRA, and DJW GELDART. 1992. "Indirect-Exchange Interactions in Disordered Metals at Finite Temperature." Physical Review B 46(9): 5318-5327. Copyright © 1992 American Physical Society.
    No abstract available.

  • Influence of the envelope function on the ground-state energy of quasi-two-dimensional Wigner solids 

    Fujiki, N. M., and D. J. W. Geldart. 1992. "Influence of the envelope function on the ground-state energy of quasi-two-dimensional Wigner solids." Physical Review B (Condensed Matter) 46(15): 9634-40. Copyright © 1992 American Physical Society.
    At sufficiently low density, quasi-two-dimensional electron systems in their ground state form Wigner solids. In previous studies of the ground-state energy of such systems (in the absence of an applied magnetic field), ...

  • Lattice sums for dipolar systems 

    Fujiki, N. M., K. De'Bell, and D. J. W. Geldart. 1987. "Lattice sums for dipolar systems." Physical Review B (Condensed Matter) 36(16): 8512-16. Copyright © 1987 American Physical Society.
    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 ...

  • Linear-response function of a semi-infinite degenerate plasma in the presence of an external magnetic field 

    Glasser, M. L., D. J. W. Geldart, and G. Gumbs. 1984. "Linear-response function of a semi-infinite degenerate plasma in the presence of an external magnetic field." Physical Review B (Condensed Matter) 29(12): 6468-73. Copyright © 1984 American Physical Society.
    The static linear-response function x0(r,r') of a semi-infinite, 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 transition-metal dichalcogenides 

    MacDonald, A. H., and D. J. W. Geldart. 1981. "Magnetic susceptibility of metallic transition-metal dichalcogenides." Physical Review B (Condensed Matter) 24(1): 469-72. Copyright © 1981 American Physical Society.
    A tight-binding model has been used to estimate the anisotropy of the magnetic susceptibility of the metallic transition-metal dichalcogenides. The calculated anisotropies obtained are in qualitative agreement with ...

  • Motion of a point dipole in an infinite hole through a superconductor 

    Yang, Z. J., R. A. Dunlap, and D. J. W. Geldart. 1993. "Motion of a point dipole in an infinite hole through a superconductor." Physical Review B (Condensed Matter) 48(6): 4172-5. Copyright © 1993 American Physical Society.
    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 electron-electron drag between narrow quantum Hall channels 

    Tso, H. C. W., D. J. W. Geldart, and P. Vasilopoulos. 1998. "Negative electron-electron drag between narrow quantum Hall channels." Physical Review B (Condensed Matter) 57(11): 6561-5. Copyright © 1998 American Physical Society.
    Momentum transfer due to Coulomb interaction between two parallel, two-dimensional, 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 many-fermion systems of arbitrary dimensionality and interparticle interaction 

    Gumbs, G., and D. J. W. Geldart. 1986. "Nonlocal exchange energy of many-fermion systems of arbitrary dimensionality and interparticle interaction." Physical Review B (Condensed Matter) 34(10): 6847-52. Copyright © 1986 American Physical Society.
    The exchange contributions to the ground-state energy of an inhomogeneous many-fermion system of arbitrary dimensionality are calculated. Explicit results are given for both the local-density approximation and the lowest-order ...