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 Panfilov³ — ¹Experimentalphysik 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 T_N=196K and T_N=295K respectively. Below T_N, 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.