Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.66: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Spin dynamics in Ca_2+xY_2−xCu₅O₁₀ — •Verena Kargl, Alex Mirmelstein, and Peter Böni — Physik-Department E21, TU München, 85748 Garching

Due to hole doping of its parent compound the copper oxide Ca_2+xY_2−xCu₅O₁₀ features particularly remarkable charge and spin dynamics. Consisting of only spin chains the compound series is characterized as a 3D Heisenberg antiferromagnet in the doping range 0 ≤ x ≤ 1.2 with the magnetic moment and the the Néel-temperature decreasing with higher Cu-valence [1]. Above the critical concentration x ∼ 1.2, a dynamical spin chain behaviour dominates, changing to a new spin coherent state in the highly doped composition Ca_4.15Cu₅O₁₀ [2]. µSR- and neutron scattering measurements give insight in the static and dynamic spin behavior developing with a change in the Ca/Y-ratio.

[1] A. Hayashi et al. , Phys. Rev. B 58, 2678 (1998)

[2] G. I. Meijer et al. , Phys. Rev. B 58, 14452 (1998)