Experimental Evidence of a Haldane Gap in an S = 2 Quasi-linear Chain Antiferromagnet

G. E. Granroth, M. W. Meisel, M. Chaparala +3

The magnetic susceptibility of the $S=2$ quasi-linear chain Heisenberg antiferromagnet (2,$2^{\prime }$-bipyridine)trichloromanganese(III), MnCl_{3}(bipy), has been measured from 1.8 to 3…