Quantum spin chains with regularly alternating bonds and fields
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We consider the spin-1/2 XY chain in a transverse field with regularly varying exchange interactions and on-site fields. In two limiting cases of the isotropic (XX) and extremely anisotropic (Ising) exchange interaction the thermodynamic quantities are calculated rigorously with the help of continued fractions. We discuss peculiarities of the low-temperature magnetic properties and a possibility of the spin-Peierls instability.
Key wordsXX chain Ising chain in a transverse field regularly alternating spin chain
- O. Derzhko: Ukrainian Journal of Physics 46 (2001) 762.Google Scholar