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
Full Text PDF
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