Zobrazeno 1 - 10
of 547
pro vyhledávání: '"Holtschneider M"'
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
Uniaxially anisotropic antiferromagnets in a field along the easy axis are studied with the help of ground state considerations and Monte Carlo simulations. For classical models, the XXZ model as well as variants, we analyze the role of non-collinear
Externí odkaz:
http://arxiv.org/abs/0803.0067
Autor:
Holtschneider, M., Selke, W.
Classical uniaxially anisotropic Heisenberg and XY antiferromagnets in a field along the easy axis on a square lattice are analysed, applying ground state considerations and Monte Carlo techniques. The models are known to display antiferromagnetic an
Externí odkaz:
http://arxiv.org/abs/0801.3217
Autor:
Holtschneider, M., Selke, W.
Publikováno v:
Phys. Rev. B 76, 220405(R) (2007)
Square lattice Heisenberg and XY antiferromagnets with uniaxial anisotropy in a field along the easy axis are studied. Based on ground state considerations and Monte Carlo simulations, the role of biconical structures in the transition region between
Externí odkaz:
http://arxiv.org/abs/0710.1251
Publikováno v:
Phys. Rev. B 75, 224417 (2007)
The classical and the quantum, spin $S=1/2, versions of the uniaxially anisotropic Heisenberg antiferromagnet on a square lattice in a field parallel to the easy axis are studied using Monte Carlo techniques. For the classical version, attention is d
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703135
Publikováno v:
Phys. Rev. B 73, 224415 (2006)
We report on measurements of the magnetic response of the anisotropic CuO_2 spin chains in lightly hole-doped La_x (Ca,Sr)_14-x Cu_24 O_41, x>=5. The experimental data suggest that in magnetic fields B >~ 4T (applied along the easy axis) the system i
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603325
Publikováno v:
Phys. Rev. B 72, 064443 (2005)
The classical, square lattice, uniaxially anisotropic Heisenberg antiferromagnet in a magnetic field parallel to the easy axis is studied using Monte Carlo techniques. The model displays a long-range ordered antiferromagnetic, an algebraically ordere
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506057
Publikováno v:
Cond. Mat. Phys. 8, 15-24 (2005)
Motivated by recent experiments on (Sr,Ca,La)_14 Cu_24 O_41, a two-dimensional Ising antiferromagnet with mobile, locally pinned and quenched defects is introduced and analysed using mainly Monte Carlo techniques. The interplay between the arrangemen
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410572
Publikováno v:
J. Magn. Magn. Mater. 290-291, 326-329 (2005)
Motivated by experiments on (Sr,Ca,La)_14 Cu_24 O_41, a two-dimensional Ising model with mobile defects and a two-dimensional anisotropic Heisenberg antiferromagnet have been proposed and studied recently. We extend previous investigations by analysi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406403
Autor:
Holtschneider, M., Selke, W.
Publikováno v:
Phys. Rev. E 68, 026120 (2003)
A two-dimensional Ising model with short-range interactions and mobile defects describing the formation and thermal destruction of defect stripes is studied. In particular, the effect of a local pinning of the defects at the sites of straight equidis
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305702