Abstract
The magnetic susceptibility of the quasi-linear-chain Heisenberg antiferromagnet (2,2′-bipyridine)trichloromanganese(III) has been measured from 1.8 to 300 K with the magnetic field parallel and perpendicular to the chains. The analyzed data yield and . The magnetization has been studied at 30 mK and 1.4 K in up to 16 T. No evidence of long-range order is observed. Depending on crystal orientation, at 30 mK until a critical field is achieved ( and ), where increases continuously as is increased. These results are interpreted as evidence of a Haldane gap.
- Received 15 April 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.1616
©1996 American Physical Society