2 papers
cond-mat.str-el1997
Mixed Heisenberg Chains. II. Thermodynamics
H. Niggemann, G. Uimin, J. Zittartz
We consider thermodynamic properties, e.g. specific heat, magnetic susceptibility, of alternating Heisenberg spin chains. Due to a hidden Ising symmetry these chains can be decompo…
cond-mat.supr-con1996
From microscopic description to statistical mechanics of Cu-O chain fragments in the high-Tc superconductors REBa_2Cu_3O_{6+x}
H. Haugerud, G. Uimin, W. Selke
The oxygen deficient CuO_x planes of the high-Tc superconductors REBa_2Cu_3O_{6+x} (RE denotes a rare-earth atom or yttrium) are studied. Starting from the Emery model for the Cu-O…