Cooperative order and excitation spectra in the bicomponent spin networks
European Physical Journal B, ISSN: 1434-6028, Vol: 75, Issue: 4, Page: 489-495
2010
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Article Description
A ferrimagnetic spin model composed of S = 1/2 spin-dimers and S = 5/2 spin-chains is studied by combining the bond-operator representation (for S = 1/2 spin-dimers) and Holstein-Primakoff transformation (for S = 5/2 spins). A finite interaction JDF 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 JDF. Due to the triplon-magnon interaction, the degeneracy of the triplons is lifted and the hybridized triplon-like excitations show different behaviors near the vanishing JDF. A mode with longitudinal polarization is identified. The hybridized magnon-like excitations are also studied. These results are compared with the experiments on Cu Fe Ge O . © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2010.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=77954564654&origin=inward; http://dx.doi.org/10.1140/epjb/e2010-00168-4; http://link.springer.com/10.1140/epjb/e2010-00168-4; http://link.springer.com/content/pdf/10.1140/epjb/e2010-00168-4; http://link.springer.com/content/pdf/10.1140/epjb/e2010-00168-4.pdf; http://link.springer.com/article/10.1140/epjb/e2010-00168-4/fulltext.html; http://www.springerlink.com/index/10.1140/epjb/e2010-00168-4; http://www.springerlink.com/index/pdf/10.1140/epjb/e2010-00168-4; https://dx.doi.org/10.1140/epjb/e2010-00168-4; https://link.springer.com/article/10.1140/epjb/e2010-00168-4; https://link.springer.com/article/10.1140%2Fepjb%2Fe2010-00168-4
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