Tuning anisotropy by impurities: magnetocaloric experiments on CsNi 0.9Fe 0.1Cl 3.

The magnetic phase diagram of the Fe²⁺ doped hexagonal ABX₃ compound CsNi_0.9Fe_0.1Cl₃ is investigated by heat capacity and magnetocaloric experiments. In spite of the high doping concentration, some phase boundaries appear surprisingly well-defined, while others are broadened significantly. The discussion of this behaviour clarifies the potentials and limitations of doping as a means to manipulate the effective anisotropy in quasi one-dimensional ABX₃ compounds. [ABSTRACT FROM AUTHOR]