Bosonic representation of one-dimensional Heisenberg ferrimagnets

Details Bosonic representation of one-dimensional Heisenberg ferrimagnets Bosonic representation of one-dimensional Heisenberg ferrimagnets

2004-01-24

arxiv.org/abs/cond-mat/0401476v1

Physics

Condensed Matter

Statistical Mechanics

to be published in Phys. Rev. B 69, No. 6, 0644XX (2004)

Scientific paper

10.1103/PhysRevB.69.064426

The energy structure and the thermodynamics of ferrimagnetic Heisenberg chains of alternating spins S and s are described in terms of the Schwinger bosons and modified spin waves. In the Schwinger representation, we average the local constraints on the bosons and diagonalize the Hamiltonian at the Hartree-Fock level. In the Holstein-Primakoff representation, we optimize the free energy in two different ways introducing an additional constraint on the staggered magnetization. A new modified spin-wave scheme, which employs a Lagrange multiplier keeping the native energy structure free from temperature and thus differs from the original Takahashi Scheme, is particularly stressed as an excellent language to interpret one-dimensional quantum ferrimagnetism. Other types of one-dimensional ferrimagnets and the antiferromagnetic limit S=s are also mentioned.

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