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

Abstract

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 300 K with the magnetic field, H, parallel and perpendicular to the chains. The analyzed data yield $g\approx 2$ and $J\approx 35$ K. The magnetization, M, has been studied at 30 mK and 1.4 K in H up to 16 T. No evidence of long-range order is observed. Depending on crystal orientation, $M\approx 0$ at 30 mK until a critical field is achieved ($H_{c\Vert }=1.2\pm 0.2T$ and $H_{c\bot} = 1.8\pm 0.2 T), where M increases continuously as H is increased. These results are interpreted as evidence of a Haldane gap.

11 pages, 4 figures

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