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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 Pr_1−xTb_xMn₂Ge₂ — •Eyüp Duman^1,2, 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 Pr_1−xTb_xMn₂Ge₂ 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 Pr_1−xTb_xMn₂Ge₂ 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