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

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

1997-07-11

arxiv.org/abs/cond-mat/9707132v1

Phys. Rev. Lett. 77 (1996) 1616

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.77.1616

The magnetic susceptibility of the $S = 2$ quasi-linear chain Heisenberg antiferromagnet (2,$2'$-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 ($H_{c\|} = 1.2\pm 0.2 T$ 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.

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