Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.58: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Tuning frustrated antiferromagnetism in intermetallic AFe4X2 systems — •Katharina Weber1,2, Nandang Mufti1, Til Goltz2, Theo Woike3, Hans-Henning Klauß2, Christoph Bergmann1, Inga Kraft1, Helge Rosner1, and Christoph Geibel1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Institute of Solid State Physics, Dresden University of Technology, Dresden, Germany — 3Institute for Structural Physics, Dresden University of Technology, Dresden, Germany
Magnetic systems with reduced dimensionality or frustration are attracting strong interest because these features lead to an increase of quantum fluctuations which often results in unusual, very interesting properties. Here we present a detailed study of the intermetallic AFe4X2 compounds (A = Sc, Y, Lu, Zr; X = Si, Ge) crystallizing in the ZrFe4Si2 structure type in which the Fe-sublattice is formed by chains of edge-linked tetrahedra. We synthesized polycrystalline samples of all these compounds and investigated their magnetic, thermodynamic, structural and transport properties. Our results indeed evidence this family of compounds to cover the whole regime from frustrated antiferromagnetic (AFM) order up to the quantum critical point separating the AFM ground state from the paramagnetic ground state. All compounds with trivalent A elements show frustrated AFM order. Replacement of trivalent A by tetravalent Zr shifts the system towards an unstable magnetic state. Since YFe4Si2 and ZrFe4Si2 present peculiar features, we also studied the influence of different annealing conditions and slight off-stoichiometry on their unusual properties.