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Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.74: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Magnetic properties of the chain antiferromagnets RbFeSe2, TlFeX2 (X=S,Se), and Tl3Fe2S4 — •Zakir Seidov1,2, Vladimir Tsurkan1,3, Hans-Albrecht Krug von Nidda1, Irina Filipov3, Axel Günther1, Arzu Najafov2, Rushana Eremina4, Tatyana Gavrilova4, Airat Kiiamov5, Farit Vagizov5, Lenar Tagirov5, and Alois Loidl11EP V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany — 2Institute of Physics, Azerbaijan Academy of Sciences, AZ- 1143 Baku, Azerbaijan — 3Institute of Applied Physics, Academy of Sciences of Moldova, MD-20208 Chisinau, Moldova — 4E.K.Zavoisky Physical Technical Institute, Russian Academy of Sciences, 420029 Kazan — 5Institute of Physics, Kazan Federal University, Kazan 420008, Russia

The ternary iron chalcogenides, monoclinic TlFeS2, TlFeSe2, RbFeSe2 consisting of linear chains of tetrahedra, and orthorhombic Tl3Fe2S4 with zigzag chains of tetrahedra have been investigated by means of magnetic susceptibility, specific heat, Mössbauer, and ESR measurements. Single crystals of TlFeS2, TlFeSe2, RbFeSe2, and Tl3Fe2S4 exhibit three-dimensional collinear antiferromagnetic order with strongly reduced moments below 196K, 290K, 248K, and 90K, respectively. The magnetic moments are oriented perpendicular to the chain direction. Tl3Fe2S4 reveals a susceptibility maximum at Tmax = 435K, which is typical for one-dimensional antiferromagnetic spin chains, whereas RbFeSe2 and TlFeX2 (X = S, Se) exhibit a continuous linear increase of the susceptibility up to the highest measurement temperature (600K) suggesting 1D metallic character.

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