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Hamburg 2001 – wissenschaftliches Programm

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AM: Magnetismus

AM 2: Magnetische Phasenüberg
änge, Elektronentheorie

AM 2.7: Vortrag

Montag, 26. März 2001, 11:45–12:00, S 5.4

Magnetic properties of TlFeX2 (X=S, Se, Te) — •Zakir Seidov1, Hans Albrecht Krug von Nida1, Joachim Hemberger1, Alois Loidl1, Geis Sultanov2, Elmira Kerimova2, and Anatoli Panfilov31Experimentalphysik V, Universität Augsburg, D-86135, Germany — 2Institut of Physics Academy of Sciences of Azerbaijan, 370143 Baku, Azerbaijan — 3B.Verkin Institut for Low Temperature Physics and Engineering, 47 Lenin ave., 310164 Kharkov, Ukraine

We report on magnetic susceptibility, magnetization, electric resistivity and ESR experiments on single crystals of TlFeX2(X=S,Se) and polycrystals of TlFeTe2. The magnetic and ESR measurements show that TlFeS2 and TlFeSe2 exhibit features typical for a one-dimensional Heisenberg antiferromagnet with TN=196K and TN=295K respectively. Below TN, within the 3d ordered phase, magnetic moments are oriented perpendicular to the chain axis. The electric resistivity reveals semiconducting behavior in both systems. For TlFeTe2 the ESR results suggest one-dimensional behavior as well. However the system undergoes an insulator to metal transition with decreasing temperature at 90K.

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