Magnetic susceptibility data
JchS >~200J_{ch^S } \gtrsim 200
meVand the experimental charge gapE
g
2 eV cannot be described in a realistic fashion. Assuming classical lattice variables, the consequences of sizable electron-lattice interactions as weak charge density waves (CDW) of spin-Peierls type and specific lattice distortions occurring for open-shell systems are briefly discussed on the basis of total energy minimizations.Key words Sr(Ca)2CuO3
- ID-multiband extended Hubbard models - spin-Peierls and CDW-BOW
On leave from Institute of Physics, Prage 8, Na Slovance 2, Czech Republic.