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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.3: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se) — •Zakir Seidov1,2, Vladimir Tsurkan2,3, Hans-Albrecht Krug von Nidda2, Axel Günther2, Irina Filipova3, and Alois Loidl21Institute of Physics, Azerbaijan National Academy of Sciences, H.Cavid ave.131, AZ-1143 Baku, Azerebaijan — 2EP V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany — 3Institute of Applied Physics, Academy of Sciences of Moldova, MD-202208 Chisinau, Moldova

Single crystals of the ternary iron chalcogenides RbFeSe2, TlFeS2, and TlFeSe2 (with linear chains consisting of FeX4 tetrahedra, X=S, Se) have been investigated by means of magnetic susceptibility, magnetization, specific heat and ESR measurements. All three compounds exhibit three-dimensional collinear antiferromagnetic order with strongly reduced moments below TN=248K, 196K, and 290K, respectively. The magnetic moments are oriented perpendicular to the chain direction. The specific heat measurements of TlFeX2 (X=S, Se) do not show any anomaly at TN[1], while there is a λ anomaly in RbFeSe2. However, the calculated entropy value for RbFeSe2 is much smaller than expected for a low-spin S=1/2 Fe3+ spin system. The linear increase of the paramagnetic susceptibility and ESR intensity of RbFeSe2 and TlFeX2 (X=S, Se) strongly suggests a one-dimensional metallic character.
[1] M.Aldzhanov et al., phys. stat. sol. (b) 159, 1990, K107.

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