Abstract

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.

Keywords

AntiferromagnetismPhysicsValence bond theoryGround stateCondensed matter physicsHeisenberg modelElectron paramagnetic resonanceValence (chemistry)Spin (aerodynamics)Chain (unit)CrystallographyAtomic physicsQuantum mechanicsElectronChemistryThermodynamicsAtomic orbital

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Publication Info

Year
1990
Type
article
Volume
65
Issue
25
Pages
3181-3184
Citations
390
Access
Closed

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Cite This

Masayuki Hagiwara, K. Katsumata, Ian Affleck et al. (1990). Observation of<i>S</i>=1/2 degrees of freedom in an<i>S</i>=1 linear-chain Heisenberg antiferromagnet. Physical Review Letters , 65 (25) , 3181-3184. https://doi.org/10.1103/physrevlett.65.3181

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DOI
10.1103/physrevlett.65.3181