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

Hagiwara, M.; Katsumata, K.; Affleck, Ian; Halperin, B.I.; Renard, J.P.

doi:10.1103/PhysRevLett.65.3181

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

Sep 20, 1990

13 pages

Published in:

Phys.Rev.Lett. 65 (1990) 25, 3181

Published: Dec 17, 1990

DOI:

10.1103/PhysRevLett.65.3181

Report number:

PRINT-90-0588

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Abstract: (APS)

THe ground state of the typical spin-1 linear-chain Heisenberg antiferromagnet Ni(

{\mathrm{C}}_{2}

{\mathrm{H}}_{8}

{\mathrm{N}}_{2}

{)}_{2}

{\mathrm{NO}}_{2}

(

{\mathrm{ClO}}_{4}

) containing a small amount of

{\mathrm{Cu}}^{2+}

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

{\mathrm{Cu}}^{2+}

sites resulting in spin-1/2 states at the

{\mathrm{Ni}}^{2+}

sites neighboring the

{\mathrm{Cu}}^{2+}

. Thus the present study gives experimental evidence for the existence of the valence-bond-solid ground state in S=1 linear-chain Heisenberg antiferromagnets.

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