Browsing Geldart, Wally by Subject "Spin Hamiltonians"

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  • 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, ...

  • 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 ...