Now showing items 1-20 of 57

  • 4th-Order Gradient Contributions in Extended Thomas-Fermi Theory for Noninteracting Fermions at Finite Temperature 

    GELDART, DJW, and E. SOMMER. 1985. "4th-Order Gradient Contributions in Extended Thomas-Fermi Theory for Noninteracting Fermions at Finite Temperature." Physical Review B 32(12): 7694-7702. Copyright © 2002 American Physical Society.
    No abstract available.
  • Adsorbate densities and surface potentials of physisorbed systems: A density-functional approach 

    Payne, S. H., H. J. Kreuzer, and D. J. W. Geldart. 1987. "Adsorbate densities and surface potentials of physisorbed systems: A density-functional approach." Physical Review B (Condensed Matter) 35(18): 9489-93. Copyright © 1987 American Physical Society.
    A density-functional approach for the calculation of the density of particles adsorbed on the surface of a solid is explored including the adparticle two-body interaction. The coverages and effective surface potentials so ...
  • Analytical structure of the wave-number-dependent susceptibility of many-fermion systems at low temperature and long wavelength. II 

    Geldart, D. J. W., and M. Rasolt. 1980. "Analytical structure of the wave-number-dependent susceptibility of many-fermion systems at low temperature and long wavelength. II." Physical Review B (Condensed Matter) 22(8): 4079-80. Copyright © 1980 American Physical Society.
    For pt.I see ibid., vol.15, p.1523 (1977). It is shown that the nonanalytic structure of the wave-number-dependent susceptibility noted by Geldart and Rasolt is not removed by including repeated particle-particle scattering
  • Analytical Structure of Wave-Number-Dependent Susceptibility of Many-Fermion Systems at Low-Temperature and Long Wavelength 

    GELDART, DJW, and M. RASOLT. 1977. "Analytical Structure of Wave-Number-Dependent Susceptibility of Many-Fermion Systems at Low-Temperature and Long Wavelength." Physical Review B 15(3): 1523-1532. Copyright © 1977 American Physical Society.
    No abstract available.
  • Anharmonicity and cross section for absorption of radiation by water dimer 

    Reproduced from Tso, H. C. W., D. J. W. Geldart, and P. Chylek. 1998. "Anharmonicity and cross section for absorption of radiation by water dimer." Journal of Chemical Physics 108(13): 5319-29, with the permission of AIP Publishing.
    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 Morse-oscillator ...
  • Anisotropic Superconductors with Repulsive Average Interaction - Comment 

    LEAVENS, CR, AH MACDONALD, and DJW GELDART. 1982. "Anisotropic Superconductors with Repulsive Average Interaction - Comment." Physical Review B 26(7): 3960-3964. Copyright © 1982 American Physical Society.
    No abstract available.
  • Anisotropy of the critical magnetic susceptibility of gadolinium 

    Geldart, D. J. W., P. Hargraves, N. M. Fujiki, and R. A. Dunlap. 1989. "Anisotropy of the critical magnetic susceptibility of gadolinium." Physical Review Letters 62(23): 2728-31. Copyright © 1989 American Physical Society.
    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 410-4t1.310-2. Uniaxial anisotropy is observed. Magnetic dipole-dipole ...
  • Coefficients to O (Epsilon-3) for the Mixed Fixed-Point of the Nm-Component Field Model 

    DEBELL, K., and DJW GELDART. 1985. "Coefficients to O (Epsilon-3) for the Mixed Fixed-Point of the Nm-Component Field Model." Physical Review B 32(7): 4763-4765. Copyright © 1985 American Physical Society.
    No abstract available.
  • Coefficients to O(3) for the mixed fixed point of the nm-component field model 

    De'Bell, K., and D. J. W. Geldart. 1985. "Coefficients to O(3) for the mixed fixed point of the nm-component field model." Physical Review B (Condensed Matter) 32(7): 4763-5. Copyright © 1985 American Physical Society.
    The nm-component field model has a number of application in the description of critical phenomena. The coefficients in the expansion for the stability matrix eigenvalues and correlation function exponent n for the mixed ...
  • Comment on `Anisotropic superconductors with repulsive average interaction' 

    Leavens, C. R., A. H. MacDonald, and D. J. W. Geldart. 1982. "Comment on `Anisotropic superconductors with repulsive average interaction'." Physical Review B (Condensed Matter) 26(7): 3960-4. Copyright © 1982 American Physical Society.
    For original paper see M.D. Whitmore and J.P. Carbotte, ibid., vol.23, p.5782 (1981). In a recent paper Whitmore and Carbotte concluded that a sufficient condition for the superconducting state to be stable relative to the ...
  • Comment on `Exact electron-gas response functions at high density' 

    Rasolt, M., D. J. W. Geldart, D. C. Langreth, and S. H. Vosko. 1988. "Comment on `Exact electron-gas response functions at high density'." Physical Review Letters 60(19): 1983-4. Copyright © 1988 American Physical Society.
    For original paper see D.C. Langreth and S.H. Vosko, ibid., vol.59, p.497 (1987). Langreth and Vosko calculated correlation contributions to the Hohenberg-Kohn energy response function Kxc(q,k). They claimed that the results ...
  • Comment on `Quantum-mechanical interpretation of the exchange-correlation potential of Kohn-Sham density-functional theory' 

    Rasolt, M., D. J. W. Geldart, M. K. Harbola, and V. Sahni. 1990. "Comment on `Quantum-mechanical interpretation of the exchange-correlation potential of Kohn-Sham density-functional theory'." Physical Review Letters 65(2): 276-7. Copyright © 1990 American Physical Society.
    For original paper see M.K. Harbola and V. Sahni, ibid., vol.62, p.489 (1989). Harbola and Sahni suggested a procedure for constructing the exchange-correlation potential that enters the Kohn-Sham single-particle equations. ...
  • Contribution of water vapor dimers to clear sky absorption of solar radiation 

    Chylek, P., Q. Fu, H. C. W. Tso, and D. J. W. Geldart. 1999. "Contribution of water vapor dimers to clear sky absorption of solar radiation." Tellus, Series A (Dynamic Meteorology and Oceanography) 51A(2): 304-13.
    Using previously derived-values 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 ...
  • Convergence properties as a function of spatial dimensionality of gradient expansions for the ground-state energy of an inhomogeneous electron gas 

    Geldart, D. J. W., and G. Gumbs. 1986. "Convergence properties as a function of spatial dimensionality of gradient expansions for the ground-state energy of an inhomogeneous electron gas." Physical Review B (Condensed Matter) 33(4): 2820-3. Copyright © 1986 American Physical Society.
    The extended Thomas-Fermi approximation for the ground-state energy of a many-fermion system is generalized to arbitrary spatial dimension. The authors' objective is a better understanding of convergence properties of such ...
  • Critical behavior of two-dimensional magnetic systems with dipole-dipole interactions 

    De'Bell, K., and D. J. W. Geldart. 1989. "Critical behavior of two-dimensional magnetic systems with dipole-dipole interactions." Physical Review B (Condensed Matter) 39(1): 743-4. Copyright © 1989 American Physical Society.
    The critical exponents of two-dimensional dipolar magnetic systems with isotropic in-plane ordering may be obtained from the expansion which determines the exponents of isotropic three-dimensional dipolar systems. However, ...
  • Critical exponents and amplitude ratios from electrical resistivity measurements of dysprosium 

    Malmstrom, G., and D. J. W. Geldart. 1980. "Critical exponents and amplitude ratios from electrical resistivity measurements of dysprosium." Physical Review B (Condensed Matter) 21(3): 1133-8. Copyright © 1980 American Physical Society.
    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 

    Reproduced from Dunlap, R. A., N. M. Fujiki, P. Hargraves, and D. J. W. Geldart. 1994. "Critical magnetic susceptibility of gadolinium." Journal of Applied Physics Sixth Joint Magnetism and Magnetic Materials - International Magnetics Conference 76(10): 6338-40, with the permission of AIP Publishing.
    No abstract available.
  • Critical magnetic susceptibility of gadolinium 

    Hargraves, P., R. A. Dunlap, D. J. W. Geldart, and S. P. Ritcey. 1988. "Critical magnetic susceptibility of gadolinium." Physical Review B (Condensed Matter) 38(4): 2862-4. Copyright © 1988 American Physical Society.
    The magnetic suspectibility of a single crystal of high-purity gadolinium has been measured in the critical region with use of AC susceptibility methods. For reduced temperatures t10-3, the data are described by a simple ...
  • Critical Magnetic-Susceptibility of Gadolinium 

    Reproduced from DUNLAP, RA, NM FUJIKI, P. HARGRAVES, and DJW GELDART. 1994. "Critical Magnetic-Susceptibility of Gadolinium." Journal of Applied Physics 76(10): 6338-6340, with the permission of AIP Publishing.
    No abstract available.
  • 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 ...