12,782 research outputs found

    Cooperative order and excitation spectra in the bicomponent spin networks

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    A ferrimagnetic spin model composed of S=1/2S=1/2 spin-dimers and S=5/2S=5/2 spin-chains is studied by combining the bond-operator representation (for S=1/2S=1/2 spin-dimers) and Holstein-Primakoff transformation (for S=5/2S=5/2 spins). A finite interaction JDFJ_{\rm DF} between the spin-dimer and the spin chain makes the spin chains ordered antiferromagnetically and the spin dimers polarized. The effective interaction between the spin chains, mediated by the spin dimers, is calculated up to the third order. The staggered magnetization in the spin dimer is shown proportional to JDFJ_{\rm DF}. It presents an effective staggered field reacting on the spin chains. The degeneracy of the triplons is lifted due to the chain magnetization and a mode with longitudinal polarization is identified. Due to the triplon-magnon interaction, the hybridized triplon-like excitations show different behaviors near the vanishing JDFJ_{\rm DF}. On the other hand, the hybridized magnon-like excitations open a gap ΔA∼JDF\Delta_A\sim J_{\rm DF}. These results consist well with the experiments on Cu2_{2}Fe2_{2}Ge4_{4}O13_{13}.Comment: 7 pages, 5 figure

    The Relationship between Interest Rates, Income, GDP Growth and House Prices

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    This paper will analyse the relationship between interest rate, income, GDP growth and house prices. First, the control power of interest rate for the prices is limited. Second, people’s income increases, thus that also increases the demand for housing. But house prices are too high and will cause buying pressure. Third, the real estate industry’s growth and GDP growth have inseparable relationship, they interact with each other
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