Thursday, May 30, 2013

1305.6703 (Jozef Strecka et al.)

Exact Ground States of Frustrated Spin-1 Ising-Heisenberg and Heisenberg
Ladders in a Magnetic Field
   [PDF]

Jozef Strecka, Frederic Michaud, Frederic Mila
Ground states of the frustrated spin-1 Ising-Heisenberg two-leg ladder with Heisenberg intra-rung coupling and only Ising interaction along legs and diagonals are rigorously found by taking advantage of local conservation of the total spin on each rung. The constructed ground-state phase diagram of the frustrated spin-1 Ising-Heisenberg ladder is then compared with the analogous phase diagram of the fully quantum spin-1 Heisenberg two-leg ladder obtained by density matrix renormalization group (DMRG) calculations. It is demonstrated that both investigated spin models exhibit quite similar magnetization scenarios, which involve intermediate plateaux at one-quarter, one-half and three-quarters of the saturation magnetization.
View original: http://arxiv.org/abs/1305.6703

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