Zobrazeno 1 - 10
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pro vyhledávání: '"Gelfand, Martin"'
Autor:
Sweeney, Mark C., Gelfand, Martin P.
We have extended Brandt's method for accurate, efficient calculations within Ginzburg-Landau theory for periodic vortex lattices at arbitrary mean induction to lattices of "doubly quantized" vortices.
Comment: 4 figures
Comment: 4 figures
Externí odkaz:
http://arxiv.org/abs/1003.4975
Autor:
Sweeney, Mark C., Gelfand, Martin P.
Sufficiently thin films of type-I superconductor in a perpendicular magnetic field exhibit a triangular vortex lattice, while thick films develop an intermediate state. To elucidate what happens between these two regimes, precise numerical calculatio
Externí odkaz:
http://arxiv.org/abs/1003.0648
Autor:
Gelfand, Martin P., Mahadevan, Mohan
Calculations of nuclear spin-lattice relaxation rates are carried out by means of exact diagonalization on small (2 x 6) antiferromagnetic Heisenberg ladders, using the simplest forms permitted by symmetry for the hyperfine couplings for the three nu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0002142
Akademický článek
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Publikováno v:
J. Phys. Soc. Jpn., 68 (1999) 247
Bond-operator mean field equations for the square-lattice, S=1/2 bilayer Heisenberg model are developed and solved numerically. In the vicinity of both the zero-field critical point and the field-induced transitions, comparisons are made with T=0 and
Externí odkaz:
http://arxiv.org/abs/cond-mat/9808048
Publikováno v:
J. Phys. Soc. Jpn, 66 (1997) 3648.
The ground state properties and phase diagram of the bilayer square-lattice Heisenberg model are studied in a broad parameter space of intralayer exchange couplings, assuming an antiferromagnetic coupling between constituent layers. In the classical
Externí odkaz:
http://arxiv.org/abs/cond-mat/9707156
Spin-S bilayer Heisenberg models (nearest-neighbor square lattice antiferromagnets in each layer, with antiferromagnetic interlayer couplings) are treated using dimer mean-field theory for general S and high-order expansions about the dimer limit for
Externí odkaz:
http://arxiv.org/abs/cond-mat/9705201
Autor:
Gelfand, Martin P., Singh, Rajiv R. P.
We study the uniform magnetic susceptibility and spin-gap for recently proposed Heisenberg model Hamiltonians for CaV_4O_9 based on the orbital ordering scenario of Marini and Khomskii and the LDA calculations of Pickett. We argue that the experiment
Externí odkaz:
http://arxiv.org/abs/cond-mat/9705122
Using conformal field theory methods Eggert and Affleck have shown that the semi-infinite S=1/2 Heisenberg antiferromagnetic chain exhibits a remarkable alternation in its local response to a uniform field at low temperatures. Such alternation is not
Externí odkaz:
http://arxiv.org/abs/cond-mat/9611178
Autor:
Singh, Rajiv R. P., Gelfand, Martin P.
Using a recently developed method for calculating series expansions of the excitation spectra of quantum lattice models, we obtain the spin-wave spectra for square lattice, $S=1/2$ Heisenberg-Ising antiferromagnets. The calculated spin-wave spectrum
Externí odkaz:
http://arxiv.org/abs/cond-mat/9509077