Zobrazeno 1 - 10
of 435
pro vyhledávání: '"Selke, W"'
Autor:
Selke, W., Wessel, S.
Publikováno v:
Eur.Phys.J. Special Topics 226, 779-788 (2017)
Classical anisotropic XY antiferromagnets in a field on square and simple cubic lattices are studied using mainly Monte Carlo simulations. While in two dimensions the ordered antiferromagnetic and spin--flop phases are observed to be separated by a n
Externí odkaz:
http://arxiv.org/abs/1609.03365
Publikováno v:
Eur. Phys. J. B 88, 204 (2015)
We study the effect of interfacial phenomena in two-dimensional perfect and random (or disordered) $q$-state Potts models with continuous phase transitions, using, mainly, Monte Carlo techniques. In particular, for the total interfacial adsorption, t
Externí odkaz:
http://arxiv.org/abs/1504.07425
Autor:
Fytas, N. G., Selke, W.
Publikováno v:
Eur. Phys. J. B 86, 365 (2013)
We study the Blume-Capel model on the square lattice. To allow for wetting and interfacial adsorption, the spins on opposite boundaries are fixed in two different states, "+1" and "-1", with reduced couplings at one of the boundaries. Using mainly Mo
Externí odkaz:
http://arxiv.org/abs/1305.2528
Publikováno v:
Physical Review B85, 054423 (2012)
Using (infinite) density matrix renormalization group techniques, ground state properties of antiferromagnetic S=1 Heisenberg spin chains with exchange and single-site anisotropies in an external field are studied. The phase diagram is known to displ
Externí odkaz:
http://arxiv.org/abs/1111.5547
Publikováno v:
Phys.: Condens. Matter 23 (2011) 496002
We study Ising ferrimagnets on square lattices with antiferromagnetic exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites, couplings between S=1 spins at next--nearest neighbour sites of the lattice, and a single--site anis
Externí odkaz:
http://arxiv.org/abs/1109.1709
Publikováno v:
J . Phys.: Conf. Ser. 200, 022046 (2010)
Using density matrix renormalization group calculations, ground state properties of the spin-1 Heisenberg chain with exchange and quadratic single-ion anisotropies in an external field are studied, for special choices of the two kinds of anisotropies
Externí odkaz:
http://arxiv.org/abs/0907.4168
Autor:
Bannasch, G., Selke, W.
Publikováno v:
J. Phys.: Conf. Ser. 200, 022057 (2010)
We study classical Heisenberg antiferromagnets with uniaxial exchange anisotropy and a cubic anisotropy term on simple cubic lattices in an external magnetic field using ground state considerations and extensive Monte Carlo simulations. In addition t
Externí odkaz:
http://arxiv.org/abs/0907.4173
Publikováno v:
Condensed Matter Physics 12, 547 (2009)
We study classical and quantum Heisenberg antiferromagnets with exchange anisotropy of XXZ-type and crystal field single-ion terms of quadratic and cubic form in a field. The magnets display a variety of phases, including the spin-flop (or, in the qu
Externí odkaz:
http://arxiv.org/abs/0907.1076
Autor:
Selke, W., Shchur, L. N.
Publikováno v:
Phys. Rev. E 80 (2009) 042104
The Binder cumulant at the phase transition of Ising models on square lattices with ferromagnetic couplings between nearest neighbors and with competing antiferromagnetic couplings between next--nearest neighbors, along only one diagonal, is determin
Externí odkaz:
http://arxiv.org/abs/0906.0721
Publikováno v:
Phys Rev B 79, 132406 (2009)
Using density matrix renormalization group calculations, ground state properties of the spin-1 Heisenberg chain with exchange and single-ion anisotropies in an external field are studied. Our findings confirm and refine recent results by Sengupta and
Externí odkaz:
http://arxiv.org/abs/0901.2081