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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Supraleitende Anwendungen (1-4) Massive HTSL, Bandleiter, Filme (5-26), Transport in HTSL (27-30), Elektronenstruktur in Supraleitern (31-43), Borkarbide (44-50), Quantenphasen- und Metall-Isolator-Überg
änge (51-69)

TT 22.55: Poster

Donnerstag, 30. März 2000, 14:00–17:30, A

Orbital and Charge Order in La_0.89Sr_0.11MnO₃. — •P. Wochner¹, A. Vigliante¹, H. Moudden², A. Revcolevschi³, L. Pinsard³, and A.M. De Leon³ — ¹MPI für Metallforschung,Heisenbergstr.1, 70569 Stuttgart — ²LLB, CEA-CNRS, France — ³UPS, France

Recently, in several synchrotron x-ray scattering studies it was shown, that orbital and charge ordering can be investigated through the use of resonant scattering methods. In the case of the manganites, there is still a debate ongoing concerning the mechanism responsible for the observed strong orbital resonances. We used this same technique to study the orbital (OO) and charge (CO) ordering in the doped manganite La_1−xSr_xMnO₃ and to shed some light on this problem. We will show, that there is a clear indication, that the splitting of the Mn 4p levels is predominantly caused by the JT distortion and not by the on-site Mn 3d-4p Coulomb repulsion contradictory to Endoh et al’s results. We will further discuss the coupling between CO and OO as well as the irradiation effect on the CO.