5 papers
Crystal Field, Magnetic Anisotropy and Excitations in Rare-Earth Hexaborides
Gennadi Uimin, Wolfram Brenig
We clarify the role of crystalline electric field (CEF) induced magnetic anisotropy in the ground state and spin-wave spectrum of cubic rare-earth materials with dominating isotrop…
Quadrupolar and magnetic ordering in CeB6
Gennadi Uimin
The quadrupolar ordering in CeB_6 is explained in terms of the electrostatic interaction of quadrupolar moments arranged into a simple cubic lattice. The representation of magnetic…
Model for the low-temperature magnetic phases observed in doped YBa_2Cu_3O_{6+x}
Niels H. Andersen, Gennadi Uimin
A classical statistical model for the antiferromagnetic (AFM) ordering of the Cu-spins in the CuO_2 planes of reduced YBa_2Cu_3O_{6+x} type materials is presented. The magnetic pha…
The One-Dimensional ANNNI model in a Transverse Field: Analytic and numerical study of Effective Hamiltonians
H. Rieger, G. Uimin
We consider a spin- chain with competing nearest and next-nearest neighbor interactions within a transverse magnetic field, which is known to be an equiavelent to the…
Concerning Order and Disorder in the Ensemble of Cu-O Chain Fragments in Oxygen Deficient Planes of Y-Ba-Cu-O
Gennadi Uimin
In connection with numerous X-ray and neutron investigations of some high temperature superconductors (YBaCuO and related compounds) a non-trivial part of the struc…