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

G. E. Granroth, M. W. Meisel, M. Chaparala, Th. Jolicœur, B. H. Ward, and D. R. Talham
Phys. Rev. Lett. 77, 1616 – Published 19 August 1996
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Abstract

The magnetic susceptibility of the S=2 quasi-linear-chain Heisenberg antiferromagnet (2,2′-bipyridine)trichloromanganese(III) has been measured from 1.8 to 300 K with the magnetic field H parallel and perpendicular to the chains. The analyzed data yield g2 and J35K. 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, M0 at 30 mK until a critical field is achieved ( Hc=1.2±0.2T and Hc=1.8±0.2T), where M increases continuously as H 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

Authors & Affiliations

G. E. Granroth and M. W. Meisel

  • Department of Physics and Center for Ultralow Temperature Research, University of Florida, 215 Williamson Hall, P.O. Box 118440, Gainesville, Florida 32611-8440

M. Chaparala

  • National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32306-3016

Th. Jolicœur

  • Service de Physique Théorique, Commissariat à l'Energie Atomique, Saclay, F-91191 Gif-sur-Yvette, France

B. H. Ward and D. R. Talham

  • Department of Chemistry, University of Florida, 200 Leigh Hall, P.O. Box 117200, Gainesville, Florida 32611-7200

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Issue

Vol. 77, Iss. 8 — 19 August 1996

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