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

Abstract

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 $J_3$.

arXiv commentPhys. Rev. Lett. 102, in press (2009)

References in corpus (4)

• Nature of the spin dynamics and 1/3 magnetization plateau in azurite
• Magnetic properties of the $S=1/2$ distorted diamond chain at T=0
• Magnetism and Thermodynamics of Spin-1/2 Heisenberg Diamond Chains in a Magnetic Field
• Dynamics of the Distorted Diamond Chain

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