Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-27
Eur. Phys. J. B15 (2000) 227-233
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages REVTeX, 7 PostScript figures included using psfig.sty; this is the final version to appear in Eur. Phys. J B; some re
Scientific paper
10.1007/s100510051120
We study the occurrence of plateaux and jumps in the magnetization curves of a class of frustrated ladders for which the Hamiltonian can be written in terms of the total spin of a rung. We argue on the basis of exact diagonalization of finite clusters that the ground state energy as a function of magnetization can be obtained as the minimum - with Maxwell constructions if necessary - of the energies of a small set of spin chains with mixed spins. This allows us to predict with very elementary methods the existence of plateaux and jumps in the magnetization curves in a large parameter range, and to provide very accurate estimates of these magnetization curves from exact or DMRG results for the relevant spin chains.
Honecker Andreas
Mila Frédéric
Troyer Matthias
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