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We study the energy spectrum of magnons in a ferromagnet with topologically nontrivial magnetization profile. In the case of inhomogeneous magnetization corresponding to a metastable state of ferromagnet, the spin-wave equation of motion acquires a g
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503013
The Heisenberg nearest neighbour antiferromagnet on the pyrochlore (3D) lattice is highly frustrated and does not order at low temperature where spin-spin correlations remain short ranged. Dzyaloshinsky-Moriya interactions (DMI) may be present in pyr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503009
We discuss the mechanism of anomalous Hall effect related to the contribution of electron states below the Fermi surface (induced by the Berry phase in momentum space). Our main calculations are made within a model of two-dimensional electron gas wit
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502386
Publikováno v:
In Fusion Engineering and Design July 2018 132:90-98
Publikováno v:
Phys. Rev. Lett. 93, 077208 (2004)
We discuss the ground state of a pyrochlore lattice of threefold-orbitally-degenerate $S=1/2$ magnetic ions. We derive an effective spin-orbital Hamiltonian and show that the orbital degrees of freedom can modulate the spin exchange, removing the inf
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404127
We present theoretical results for a Kondo-lattice model with spin-1/2 localized moments, including both the intrasite Kondo coupling and an intersite antiferromagnetic exchange interaction, treated within an extended mean-field approximation. We des
Externí odkaz:
http://arxiv.org/abs/cond-mat/0212034
A new model of localized highly frustrated ferromagnetism is presented: kagome spin ice. By use of analytical and Monte Carlo calculations its massive groundstate entropy is evaluated. Monte Carlo calculations are also used to explore the phases in t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208303
The $S=1/2$ Heisenberg antiferromagnet is studied on the kagom\'e lattice by using a Green's function method based on an appropriate decoupling of the equations of motion. Thermodynamic properties as well as spin-spin correlation functions are obtain
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202257
The stability of the disordered ground state of the classical Heisenberg pyrochlore antiferromagnet is studied within extensive Monte Carlo simulations by introducing an additional exchange interaction $J'$ that interpolates between the pyrochlore la
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202196