Regensburg 2002 – wissenschaftliches Programm
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MA: Magnetismus
MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111
MA 10.97: Poster
Dienstag, 12. März 2002, 15:00–19:00, Bereich A
Magnetic interactions in Pr1−xTbxMn2Ge2 — •Eyüp Duman1,2, Mehmet Acet1, Yalçin Elerman2, Ayhan Elmali2, and Eberhard F. Wasserman1 — 1Tieftemperaturphysik, Gerhard-Mercator Universität Duisburg, 47048 Duisburg, Germany — 2Dept. of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Besevler-Ankara, Turkey
The magnetic moments in the rare earth (R) and Mn sublattices of RMn2Ge2, feature a variety of ordering configurations. In PrMn2Ge2 and TbMn2Ge2, the interlayer magnetic coupling in the Mn sublattice is respectively ferromagnetic and antiferromagnetic below about 350 K. At low temperatures, the rare earth sublattice also orders and reconfigures the ordering in the Mn sublattice. In this study, we investigate the variations in the magnetic properties of Pr1−xTbxMn2Ge2 as a function of rare earth concentration by examining the evolution of the features in the temperature dependence of the magnetization. The results of earlier neutron diffraction and Mössbauer are also used for interpreting the magnetization data and to give an account on the competing effects between various magnetic structures in the Mn and rare earth sublattices. The results are summarized in the Pr1−xTbxMn2Ge2 magnetic phase diagram. [1] R. Welter, G. Venturini, E. Ressouche and B. Malaman, J. Alloys and Comp., 218, (1995), 204 [2] G. Venturini, B. Malaman, E. Ressouche, J. Alloys and Comp., 240, (1996), 139