Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.71: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Weak Itinerant Ferromagnetism and Half-Metallicity in the New Filled Skutterudite TlFe4Sb12 — •Andreas Leithe-Jasper1, Walter Schnelle1, Helge Rosner1, Michael Baenitz1, Raul Cardoso-Gil1, John A. Mydosh2, and Yuri Grin1 — 1MPI für Chemische Physik fester Stoffe, Dresden, Germany — 2II. Physikalisches Institut, Universität zu Köln, Germany
The chemical, structural and magnetic properties of the new filled skutterudite TlFe4Sb12 are described. X-ray diffraction and elemental analysis established the cubic crystal structure (a = 9.1959(2) Å) without defects and disorder at the cationic site. The electronic structure is calculated by FPLO methods. Electronic structure calculations within the LDA exhibit a band ferromagnetic ground state and predict a nearly perfect half metallic state (97.5 %) similar to the isotypic compounds MFe4Sb12 (M = Na, K) [1,2,3].
From experiments, TlFe4Sb12 is an itinerant electron ferromagnet with small magnetic moments (Mr = 0.30µB/Fe atom) and TC ≈ 85 K. A Curie-Weiss behaviour with a paramagnetic moment per Fe-atom of 1.69 µB and Θ ≈ TC is observed above TC, similar to MFe4Sb12 (M = Na, K). The results of an NMR study are discussed.
[1] A. Leithe-Jasper et al., Phys. Rev. Lett. 91, 037208 (2003).
[2] A. Leithe-Jasper et al., Phys. Rev. B 70, 214418 (2004).
[3] G. Sheet et al., Phys. Rev. B RC, in print (2005).