Antiferromagnetic Ordering and Paramagnetic Behavior of Ferromagnetic Cu ₆ and Cu ₁₈ Clusters in BaCuO _{2+
x}

15 April 1994

journal article
other
Published by American Association for the Advancement of Science (AAAS) in Science

Vol. 264 (5157) , 402-404
https://doi.org/10.1126/science.264.5157.402

Abstract

Magnetization and neutron diffraction measurements on polycrystalline BaCuO _{2+
x} revealed a combination of magnetic behaviors. The Cu ₆ ring clusters and Cu ₁₈ sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu ₆ rings ordered antiferromagnetically below the Néel temperature T _N = 15 ± 0.5 kelvin, whereas the Cu ₁₈ spheres remained paramagnetic down to 2 kelvin. The ordered moment below T _N was 0.89(5) Bohr magnetons per Cu in the Cu ₆ rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu ₁₈ clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.

Keywords

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Antiferromagnetic Ordering and Paramagnetic Behavior of Ferromagnetic Cu 6 and Cu 18 Clusters in BaCuO 2+ x

Abstract

Keywords

Antiferromagnetic Ordering and Paramagnetic Behavior of Ferromagnetic Cu ₆ and Cu ₁₈ Clusters in BaCuO _{2+
x}