J. Phys. Soc. Jpn. 67 (1998) pp. 2205-2208  |Next Article|  |Table of Contents|
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Susceptibility and Triplet Excitation Spectrum for CaV ₄O ₉: Third-Order Perturbation Expansions

Yoshiyuki Fukumoto and Akihide Oguchi

(Received March 30, 1998)

The uniform susceptibility and triplet excitation spectrum of the Heisenberg antiferromagnet on the one-fifth depleted square lattice are calculated using the third-order perturbation expansion method from the viewpoint of the weakly coupled meta-plaquette picture. Both the susceptibility and triplet excitation spectrum data for CaV₄O₉ are simultaneously explained. The origin of the relatively large spin gap in this compound is discussed. ©1998 The Physical Society of Japan

KEYWORDS: CaV₄O₉, uniform susceptibility, triplet excitation spectrum, spin gap, Heisenberg antiferromagnet, two dimensions, perturbation expansion, plaquette network
URL: http://jpsj.ipap.jp/link?JPSJ/67/2205/
DOI: 10.1143/JPSJ.67.2205

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