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Pré-Publication, Document De Travail Année : 2008

Spin Configuration in the 1/3 Magnetization Plateau of Azurite determined by NMR

Résumé

High magnetic field $^{63,65}$Cu NMR spectra were used to determine the local spin polarization in the 1/3 magnetization plateau of Azurite, Cu$_3$(CO$_3$)$_2$(OH)$_2$, which is a model system for the distorted diamond antiferromagnetic spin-1/2 chain. The spin part of the hyperfine field of the Cu2 (dimer) sites is found to be field independent, negative and strongly anisotropic, corresponding to $\approx$10\,\% of fully polarized spin in a $d$-orbital. This is close to the expected configuration of the ``quantum'' plateau, where a singlet state is stabilized on the dimer. However, the observed non-zero spin polarization points to some triplet admixture, induced by strong asymmetry of the diamond bonds $J_1$ and $J_3$.
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Dates et versions

hal-00350473 , version 1 (06-01-2009)
hal-00350473 , version 2 (24-02-2009)

Identifiants

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F. Aimo, S. Kramer, M. Klanjsek, M. Horvatic, C. Berthier, et al.. Spin Configuration in the 1/3 Magnetization Plateau of Azurite determined by NMR. 2008. ⟨hal-00350473v1⟩
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