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7 papers · 2 filters
Magnetic properties of a spin-1/2 quadrumer chain
Andreas Honecker, Wolfram Brenig
We study a novel S=1/2 cluster chain Hamiltonian which has recently been proposed in the context of the charge ordered low-temperature phase of alpha'-NaV2O5. We perform a detailed…
Lanczos Study of the S=1/2 Frustrated Square-Lattice Antiferromagnet in a Magnetic Field
A. Honecker
We study the zero-temperature phase diagram of the frustrated square-lattice S=1/2 antiferromagnet in an external magnetic field numerically with the Lanczos algorithm. For strong…
Emergence of Irrationality: Magnetization Plateaux in Modulated Hubbard Chains
D. C. Cabra, A. De Martino, A. Honecker +2
Hubbard chains with periodically modulated coupling constants in a magnetic field exhibit gaps at zero temperature in their magnetic and charge excitations in a variety of situatio…
Single-hole dynamics in dimerized and frustrated spin-chains
Christoph Jurecka, Wolfram Brenig
We present a unified account for the coupled single-hole- and spin-dynamics in the spin-gap phase of dimerized and frustrated spin-chains and two-leg spin ladders. Based on the str…
Dzyaloshinskii-Moriya interaction in NaVO: a microscopic study
Roser Valenti, Claudius Gros, Wolfram Brenig
We present a unified account of magnetic exchange and Raman scattering in the quasi-one-dimensional transition-metal oxide NaVO. Based on a cluster-model approach explicit…
Frustrated trimer chain model and Cu3Cl6(H2O)2 2H8C4SO2 in a magnetic field
A. Honecker, A. Läuchli
Recent magnetization and susceptibility measurements on Cu3Cl6(H2O)2 2H8C4SO2 by Ishii et.al. [J. Phys. Soc. Jpn. 69, 340 (2000)] have demonstrated the existence of a spin gap. In…