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Phys. Rev. Lett. 65, 3181 - 3184 (1990)

Observation of S=1/2 degrees of freedom in an S=1 linear-chain Heisenberg antiferromagnet

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M. Hagiwara and K. Katsumata
The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01, Japan

Ian Affleck
Canadian Institute for Advanced Research and Physics Department, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6

B. I. Halperin
Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138

J. P. Renard
Institut d’Electronique Fondamentale, Bâtiment 220, Université Paris–Sud, 91405 Orsay CEDEX, France

Received 31 July 1990

THe ground state of the typical spin-1 linear-chain Heisenberg antiferromagnet Ni(C2H8N2)2NO2(ClO4) containing a small amount of Cu2+ is studied by the electron-spin-resonance (ESR) technique. The ESR results are qualitatively explained by the model that the valence bonds are broken at the Cu2+ sites resulting in spin-1/2 states at the Ni2+ sites neighboring the Cu2+. Thus the present study gives experimental evidence for the existence of the valence-bond-solid ground state in S=1 linear-chain Heisenberg antiferromagnets.


©1990 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.65.3181
DOI: 10.1103/PhysRevLett.65.3181
PACS: 75.10.Jm, 75.30.Hx, 76.30.Fc

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