Quantum spin chains with regularly alternating bonds and fields

Details Quantum spin chains with regularly alternating bonds and fields Quantum spin chains with regularly alternating bonds and fields

2001-12-01

arxiv.org/abs/cond-mat/0112014v1

Czechoslovak Journal of Physics, Vol. 52 (2002), Suppl. A, p.A277-A280

Physics

Condensed Matter

Presented at 11-th Czech and Slovak Conference on Magnetism, Ko\v{s}ice, 20-23 August 2001

Scientific paper

10.1007/s10582-002-0067-3

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.

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