The susceptibility of (CHs)2NH2Mnl-,CdxC13, agood quasi-ldHeisenbergsystem, has been measured along the three principal crystallographic directions for 1.5 < T < 4.2 K and x = 0.067. The experimental data are compared successively with the susceptibility of the exactly soluble isotropic Heisenberg chain, the predictions based on numerical calculations of a Heisenberg chain with orthorhombic anisotropy, and a newly developed shortchain approximation. The effective anisotropy per spin is found to decrease by di…
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