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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 12: Correlated Electrons - Spin Systems and Itinerant Magnets: Experiment

TT 12.8: Talk

Saturday, March 5, 2005, 12:30–12:45, TU H2053

Co-L2,3 XMCD study on one-dimensional Ca3Co2O6 single crystals — •Z. Hu1, M.W. Haverkort1, J. Gegner1, A. Maignan2, N.B. Brookes3, J.C. Cezar3, and L.H. Tjeng11II. Physikalisches Institut, Universität zu Köln — 2Laboratoire CRISMAT, Caen, France — 3European Synchrotron Radiation Facility, Grenoble, France

We have carried out x-ray magnetic circular dichroism (XMCD) measurements at the Co-L2,3 edges on single crystals of Ca3Co2O6, in which Co(1)O6 octahedron alternates with Co(2)O5 trigonal prism along the chain. We found that the dichroism in the L3 edge mainly occurs in the lower part of the spectrum and that the dichroism in the L2 edge is negligible. In combination with cluster model simulations, we deduce that the dichroism originates from the trigonal prism Co3+(2) ions which are in the high spin state and that the octahedron Co3+(1) ions are nonmagnetic, i.e. in the low spin state. From the orbital sum rule we obtain an orbital moment of 1.2 µB for the Co3+(2).

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