Quasi-one-dimensional spin chains in CuSiO3: an EPR study
  Temperature dependent EPR studies were performed on a single crystal of CuSiO3.This recently discovered compound is isostructural with the spin-Peierls compound CuGeO3. The EPR signals show different characteristics than those of CuGeO3 and aredue to Cu2+ spins located along quasi one-dimensional chains. For T > 8.2K the spin susceptibility closely follows the predictions of a S=1/2 one-dimensional Heisenberg antiferromagnet with J/kB = 21K. Below T = 8.2K the spin susceptibility immediately drops to zero indicating long range magnetic order. 
J. Sichelschmidt (1 and 2), A. Loidl (1), M. Baenitz (2), H. H. Otto   (3), C. Geibel (2), and F. Steglich (2) ((1) Experime...