Antiferromagnetic long-range order in Cu_{1-x}Zn_xGeO_3 with extremely low Zn concentration

Physics – Condensed Matter – Strongly Correlated Electrons

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4 pages, 5 Postscript figures, uses revtex. To be published in Phys. Rev. B, Rapid Communications

Scientific paper

10.1103/PhysRevB.58.R575

We have measured the magnetic susceptibilities of single crystals of Cu_{1-x}Zn_xGeO_3 with extremely low Zn concentration (x) lower than x=5x10^{-3} at very low temperatures to investigate the spin-Peierls and antiferromagnetic transitions. The results show that the undoped CuGeO_3 has no antiferromagnetic phase down to 12 mK and there exists an antiferromagnetic long-range order with the easy axis along the $c$ axis for x down to 1.12(2)x10^{-3}. The minimum observed Neel temperature was 0.0285 K for x=1.12(2)x10^{-3} sample. From the concentration dependence of the Neel temperature it is concluded that there is no critical concentration for the occurrence of the antiferromagnetic long-range order.

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