Title:
THERE IS LIFE IN THE OLD HORSE YET OR WHAT ELSE WE CAN LEARN
STUDYING SPIN-1/2 XY CHAINS
Author(s):
O.Derzhko (Institute for Condensed Matter Physics
of the National Academy of Sciences of Ukraine,
1 Svientsitskii Str., 79011 Lviv, Ukraine; Chair of Theoretical Physics,
Ivan Franko National University of Lviv,
12 Drahomanov Street, 79005 Lviv, Ukraine)
We review some recent results on statistical mechanics of the one-dimensional spin-$\frac{1}{2}$ $XY$ systems paying special attention to the dynamic and thermodynamic properties of the models with Dzyaloshinskii-Moriya interaction, correlated disorder, and regularly alternating Hamiltonian parameters.
Key words:
spin-$\frac{1}{2}$ $XY$ chains, Dzyaloshinskii-Moriya
interaction, correlated disorder, magnetization plateaus,
spin-Peierls instability
PACS:
75.10.-b
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