Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.90: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Investigation of orbital ordering in La7/8Sr1/8MnO3 by means of x-ray linear dichroism at the Mn L edge — •K. Kuepper1,2, F. Bondino3, K. C. Prince3,4, M. Zangrando3, M. Zacchigna3, A. F. Takács2, M. Matteucci5, F. Parmigiani6, A. Winiarski7, V. R. Galakhov8, Ya. M. Mukovskii9, and M. Neumann2 — 1Forschungszentrum Rossendorf, D-01328 Dresden, Germany — 2University of Osnabrück, Department of Physics, D-49069 Osnabrück, Germany — 3Laboratorio TASC-INFM, I-34012 Basovizza (Trieste), Italy — 4Sincrotrone Trieste, I-34012 Basovizza (Trieste), Italy — 5ICGEB, I-34012 Trieste, Italy — 6Dipartimento di Matematica e Fisica, Università Cattolica, del Sacro Cuore, Brescia, Italy — 7Silesian Univ., A. Chelkowski Inst. Phys., PL-40007 Katowice, Poland — 8Institute of Metal Physics, 620219 Yekaterinburg GSP-170, Russia — 9Moscow State Steel and Alloys Institute, 117936 Moscow, Russia
We have investigated for the first time the orbital ordering in a three dimensional colossal magneto resistance manganite, namely La7/8Sr1/8MnO3, by applying soft x-ray linear dichroism (XLD) to the Mn L edge [1]. We found that the cooperative Jahn Teller distorted orthorhombic phase, which is present at a temperature of 240 K, is probably accompanied by a predominantly cross type (x2−z2)/(y2−z2) orbital ordering. This result is discussed in the light of previous results obtained by means of resonant x-ray scattering at the Mn K edge and different exchange interaction models.
[1] K. Kuepper et al., J. Phys. Chem. B 109, 15667 (2005)