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The Evolution of the Antiferromagnetic Structure of the Terbium Titanium Oxysulfide Tb2Ti2S2O5 between 5K and 1.4K

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Abstract:

The Tb2Ti2S2O5 compound belongs to the lanthanide titanium oxysulfides family Ln2Ti2S2O5. The 3D-structure can be schematically described as a 2D-stacking of [Tb2S2] layers alternating with [Ti2O5] ones. The magnetic structure of this compound was determined from neutron diffraction experiments on a powder sample in the 1.4 K - 15 K temperature range. An incommensurate antiferromagnetic long-range order (LRO) occurs at temperatures ranging from 4.1 K to 2.9 K, which turns to a commensurate state below 2.4 K. The evolution of the propagation vector from ki, ⃗ (kx,0,0), kx ≈ 0.46 to kc, ⃗(1/2,0,1/2) is quite unusual. The origin of this unusual change in direction of the propagation vector is not yet explained. On the other hand, a quite large part of the total magnetic moment is involved in a short range ordering (SRO). The refinement procedure taking into account the different coexisting magnetic phases leads to a smooth variation of the total magnetic moment versus temperature.

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Periodical:

Materials Science Forum (Volumes 443-444)

Pages:

387-390

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.443-444.387

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Online since:

January 2004

Authors:

A. Lafond, O. Leynaud, G. André, F. Bourée, M. Caldès, A. Meerschaut

Keywords:

Incommensurate Magnetic Structure, Oxysulfide, Rare Earth (RE), Short Range Order (SRO)

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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