DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2002 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

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 10.50: Poster

Tuesday, March 12, 2002, 15:00–19:00, Bereich A

Magnetisation studies on U1−xPuxO2 single crystals — •D. Kolberg1,2, F. Wastin1, J. Rebizant1, and J. Schoenes21European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe — 2Institut für Halbleiterphysik und Optik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig

Mixed uranium-plutonium dioxides are important for their use as reactor fuel, and the corner compounds UO2 and PuO2 show unusual solid state properties. Single crystals of U1−xPuxO2 have been grown for a large range of concentrations from x=0.05 to x=0.95 by means of chemical vapor transport reaction. Magnetisation and susceptibility data were taken on encapsulated samples using a commercial SQUID magnetometer. Ordering temperatures TN have been determined as well as paramagnetic Curie temperatures ΘP and effective magnetic moments µeff. We found a rather complicated behaviour for ΘP and µeff as a function of x. Spin-lattice interactions manifest themselves in non-linearities of the observed 1/χ vs. T curves from which we are able to suggest different mechanisms for the interactions as a function of the constituent’s concentrations. From our susceptibility measurements characteristic parameters have been calculated using a model of tetragonal vibrational modes of the oxygen cage surrounding each uranium ion. These include specific spin-lattice coupling parameters G, mode characteristic temperatures Tω, and molecular field constants λ.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2002 > Regensburg