Frustrated quantum Heisenberg ferrimagnetic chains

Abstract

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.

16 pages (LaTex 2.09), 6 eps figures

References in corpus (3)

• Competition between plaquette and dimer phases in Heisenberg chains
• Spin Chains with Periodic Array of Impurities
• Alternating spin chains with singlet ground states

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