Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)
TT 6.14: Poster
Montag, 24. März 2003, 14:30–19:00, P2c, P2d
Magnetism and transport properties in La1−xSr1+xMnO4 layered manganites — •P. Reutler1,2, D. Cattani3, U. Oetter1, C. Baumann1,3, M. Braden4, B. Büchner1, and A. Revcolevschi2 — 1II. Physikalisches Institut, RWTH Aachen — 2Laboratoire de Physico-Chimie de l’Etat Solide, Université Paris-Sud — 3Dipartimento di Fisica, Universita di Parma — 4II. Physikalisches Institut, Universität zu Köln
The impact of the orbital degree of freedom to the physical properties in layered manganite single crystals La1−xSr1+xMnO4 (0≤ x≤ 0.5) was investigated by different experimental techniques, as thermal and electric transport µSR, NMR, and magnetization measurements. As a function of doping, a continuous transition of the orientation of the occupied eg orbital perpendicular to the MnO plane (x=0) to an occupation in the plane (x≈0.5) is observed, leading for x=0.5 to the well established charge-orbital ordering at low temperatures. This transition is further manifested in the magnetic ordering, being at low doping levels (x=0,1/8) of antiferromagnetic, at intermediate doping levels (x=1/4,0.4) spin-glass-like, and for x=0.5 CE-type antiferromagnetic nature.