Pair Dynamical Correlated-Effective-Field Approximation.

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  • Kokado Satoshi
    Division of Material Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama–cho, Toyonaka, Osaka 560
  • Suzuki Naoshi
    Division of Material Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama–cho, Toyonaka, Osaka 560

Bibliographic Information

Other Title
  • Pair Dynamical Correlated-Effective-Fie
Published
1997
DOI
  • 10.1143/jpsj.66.3605
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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Description

The dynamical correlated-effective-field approximation (DCEFA) developed by Suzuki is extended to the pair-approximation, in which the spin-pair is solved exactly and the interaction between the pairs is treated by the DCEFA. The approximation is applied to calculate magnetic excitation and uniform static susceptibility of S=1/2 exchange-alternating chains.The obtained results agree reasonably well with those obtained by the exact diagonalization method for finite spins. The approximation is applied also to real pseudo-one-dimensional antiferromagnetic-ferromagnetic alternating systems such as Cu(TIM)CuCl4, (4-BzpipdH)CuCl3 and MeNN, and the exchange couplings including interchain coupling in these systems are evaluated.

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