Phase diagram of a frustrated mixed-spin ladder with diagonal exchange bonds

Details Phase diagram of a frustrated mixed-spin ladder with diagonal exchange bonds Phase diagram of a frustrated mixed-spin ladder with diagonal exchange bonds

2004-04-29

arxiv.org/abs/cond-mat/0404703v1

Phys. Rev. B 69, 214420 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 PRB pages, 7 eps figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.214420

Using exact numerical diagonalization and the conformal field theory approach, we study the effect of magnetic frustrations due to diagonal exchange bonds in a system of two coupled mixed-spin $(1,{1/2})$ Heisenberg chains. It is established that relatively moderate frustrations are able to destroy the ferrimagnetic state and to stabilize the critical spin-liquid phase typical for half-integer-spin antiferromagnetic Heisenberg chains. Both phases are separated by a narrow but finite region occupied by a critical partially-polarized ferromagnetic phase.

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