J. Phys. Soc. Jpn. 75S (2006) pp. 121-123  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Incommensurate Longitudinal SDW State with a Long Periodicity in UCu₂Si₂

Fuminori Honda¹, Naoto Metoki^1,2, Tatsuma D. Matsuda¹, Yoshinori Haga¹ and Yoshichika Ōnuki^1,3

Neutron diffraction experiment on a high quality single crystal of UCu₂Si₂ has been carried out in order to clarify magnetic structures of this compound. At T = 101 K, we have observed incommensurate magnetic satellite reflections with the propagation q = [0 0 δ], δ= 0.116, indicating the magnetic amplitude modulation with a long periodicity, Λ= 85.7 Å corresponding to roughly 17 uranium basal plane layers. From a careful analysis of integrated intensities of the magnetic satellites, we determined that the magnetic structure of antiferromagnetic phase is the longitudinal and nearly sinusoidal spin density modulation with the first and third order modulation amplitude µ₁ = 1.3 µ_B/U and µ₃ = 0.1 µ_B/U, respectively. The mean field behavior of the antiferromagnetic order parameter, µ₁ ∝(T_N-T)^1/2 is consistent with the gap formation of a SDW/CDW state. These results can be illustrated with the strong itinerant character of 5f electrons in this compound.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/121/
DOI: 10.1143/JPSJS.75S.121

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