Frustrated quantum Heisenberg ferrimagnetic chains

Details Frustrated quantum Heisenberg ferrimagnetic chains Frustrated quantum Heisenberg ferrimagnetic chains

1998-03-12

arxiv.org/abs/cond-mat/9803150v1

Phys. Rev. B 58, 14 456(1998).

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages (LaTex 2.09), 6 eps figures

Scientific paper

10.1103/PhysRevB.58.14456

We study the ground-state properties of weakly frustrated Heisenberg ferrimagnetic chains with nearest and next-nearest neighbor antiferromagnetic exchange interactions and two types of alternating sublattice spins S_1 > S_2, using 1/S spin-wave expansions, density-matrix renormalization group, and exact- diagonalization techniques. It is argued that the zero-point spin fluctuations completely destroy the classical commensurate- incommensurate continuous transition. Instead, the long-range ferrimagnetic state disappears through a discontinuous transition to a singlet state at a larger value of the frustration parameter. In the ferrimagnetic phase we find a disorder point marking the onset of incommensurate real-space short-range spin-spin correlations.

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