Recent Submissions

  • 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.
  • 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.
  • 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
  • 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 ...
  • 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 ...
  • Two-component scaling near the metal-insulator bifurcation in two dimensions 

    Geldart, D. J. W., and D. Neilson. 2003. "Two-component scaling near the metal-insulator bifurcation in two dimensions." Physical Review B (Condensed Matter and Materials Physics) 67(20): 205309-1. Copyright © 2003 American Physical Society.
    We consider a two-component scaling picture for the resistivity of two-dimensional (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 low-resistance region for diffusive transport in two dimensions 

    Geldart, D. J. W., and D. Neilson. 2004. "Temperature dependent resistivity in the low-resistance region for diffusive transport in two dimensions." Physical Review B (Condensed Matter and Materials Physics) 70(23): 235336-1. Copyright © 2004 American Physical Society.
    The interpretation of the metal-insulator transition phenomena in disordered two-dimensional electron systems in terms of density-dependent scaling variables suggests the existence of a quantum critical point at some ...
  • 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 ...
  • Quantum critical behavior in the insulating region of the two-dimensional metal-insulator transition 

    Geldart, D. J. W., and D. Neilson. 2007. "Quantum critical behavior in the insulating region of the two-dimensional metal-insulator transition." Physical Review B (Condensed Matter and Materials Physics) 76(19): 193304-1. Copyright © 2007 American Physical Society.
    We show that the quantum critical point associated with the metal-insulator 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 

    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 ...
  • Surface-induced quantum density oscillations in the presence of an external magnetic field 

    Geldart, D. J. W., G. Gumbs, and M. L. Glasser. 1985. "Surface-induced quantum density oscillations in the presence of an external magnetic field." Physical Review B (Condensed Matter) 31(6): 3315-22. Copyright © 1985 American Physical Society.
    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 ...
  • 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 ...
  • 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 ...
  • Short-distance expansion for the spin-spin correlation function of uniaxial dipolar systems 

    Fujiki, N. M., K. De'Bell, and D. J. W. Geldart. 1992. "Short-distance expansion for the spin-spin correlation function of uniaxial dipolar systems." Physical Review B (Condensed Matter) 45(9): 4686-94. Copyright © 1992 American Physical Society.
    Motivated by recent work on the critical resistivity of gadolinium, a detailed study has been made of the temperature dependence of the two-point vertex function in the large-momentum regime. The operator-project expansion ...
  • 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 ...
  • 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), ...
  • 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 ...
  • 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.
  • 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 ...

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