Spin-1/2 Periodic Nonuniform XX Chains and the Spin-Peierls Instability |
| O. Derzhkoa,b, J. Richterc and O. Zaburannyib a Institute for Condensed Matter Physics, 1 Svientsitskii St., L'viv-11, 290011, Ukraine b Chair of Theoretical Physics, Ivan Franko State University of L'viv, 12 Drahomanov St., L'viv-5, 290005, Ukraine c Institut für Theoretische Physik, Universität Magdeburg, P.O. Box 4120, 39016 Magdeburg, Germany |
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| Using continued fractions we obtained the exact result for the density of magnon states of the regularly alternating spin-1/2 XX chain with the Dzyaloshinskii-Moriya interaction. We examined the stability of the magnetic chain with respect to the spin-Peierls dimerization. |
| DOI: 10.12693/APhysPolA.97.931 PACS numbers: 75.10.-b |