INFLUENCE OF A NONMAGNETIC IMPURITY ON THE PROPERTIES OF THE QUASI-ONE-DIMENSIONAL ANTIFERROMAGNET CSNICL3

Various magnetic properties of the diluted quasi-one-dimensional antif erromagnet CsNi1-xMgxCl3 are investigated experimentally for several i mpurity concentrations. The antiferromagnetic resonance spectrum and t he phase diagrams are found to depend significantly on the amount of a dded Mg. The field and temperature dependences of the static magnetiza tion is measured for crystals with two different contents x. A substan tial increase in the magnetization is observed at low temperature, whe re the additional susceptibility is approximately proportional to the concentration. The physical mechanisms underlying the observed strong influence of magnetic defects formed at breaks in the spin chains in a quasi-one-dimensional antiferromagnet on its magnetic properties in t he ordered state and for T>T-N are discussed. (C) 1997 American Instit ute of Physics.