Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-21
Eur. Phys. J. B15 (2000) 423-434
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages LaTeX2e with EPJ macro package (included), 8 (e)ps figures included using psfig.sty; this is the final version to app
Scientific paper
CsCuCl_3 is a ferromagnetically stacked triangular spin-1/2 antiferromagnet. We discuss models for its zero-temperature magnetization process. The models range from three antiferromagnetically coupled ferromagnetic chains to the full three-dimensional situation. The situation with spin-1/2 is treated by expansions around the Ising limit and exact diagonalization. Further, weak-coupling perturbation theory is used mainly for three coupled chains which are also investigated numerically using the density-matrix renormalization group technique. We find that already the three-chain model gives rise to the plateau-like feature at one third of the saturation magnetization which is observed in magnetization experiments on CsCuCl_3 for a magnetic field perpendicular to the crystal axis. For a magnetic field parallel to the crystal axis, a jump is observed in the experimental magnetization curve in the region of again about one third of the saturation magnetization. In contrast to earlier spinwave computations, we do not find any evidence for such a jump with the model in the appropriate parameter region.
Honecker Andreas
Kaulke M.
Schotte Klaus-Dieter
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