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We investigate the zero-temperature and the finite-temperature properties ofthe two-dimensional antiferromagnetic quantum spin system composed of the s=1/2and s=1 spins. The spin excitation spectrum as well as the thermodynamicquantities are computed by means of the Schwinger-boson mean-field theory. Wediscuss how the magnetic double structure with the gapful and the gaplessexcitations is generated, and apply the results systematically to the Haldanegap system in a staggered magnetic field and also to the weakly coupledferrimagnetic mixed-spin chains. It is confirmed that the results obtained areconsistent with the experiments for the quasi-one-dimensional Haldane compounds$R_2 \rm BaNiO_5$.Comment: 7 pages, REVTeX, 11 figures, to appear in P.R.

physical review. b, condensed matter

Magnetic double structure for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mn /></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>mixed-spin systems

Magnetic double structure forS=1andS=1/2mixed-spin systems