Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.143: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Magnetic properties in chromium-chalcogenide systems — •Diana Benea¹, Hubert Ebert¹, Wolfgang Bensch², and Zhong-Le Huang² — ¹Department of Chemistry and Biochemistry, LMU-Munich, Germany — ²Institute for Inorganic Chemistry, CAU-Kiel, Germany

A detailed theoretical and experimental investigation on the electronic and magnetic properties of several Cr-Te systems with the Te concentration between 60.6 and 62.2 % have been performed. Depending on the heat treatment and on the composition, these systems show different structures with a monoclinic, trigonal supercell and trigonal basic unit cell. The phase transitions between these crystallographic structures induced by a change in composition is discussed. The preferential occupation of the metal layers evidenced by X-ray and neutron scattering experiments is investigated by theoretical calculations. In addition, the influence of the substitution of Cr and Te by Ti and Se, respectively, on the magnetic properties of the system is discussed. All investigations of the electronic, magnetic and structural properties have been done using the Korringa-Kohn-Rostoker (KKR) band structure method. The disorder in the system has been accounted for by means of the Coherent Potential Approximation (CPA).