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Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Spin Systems and Itinerant Magnets

TT 14.13: Talk

Tuesday, March 27, 2007, 17:45–18:00, H19

Orbitally Ordered Phase in Ca2−xSrxRuO4 Investigated with Resonant X-ray Diffraction — •Ioannis Zegkinoglou1, Joerg Strempfer2, Britta Bohnenbuck1, Christie S. Nelson3, John P. Hill3, Jonathan C. Lang4, George Srajer4, Yoshiteru Maeno5, and Bernhard Keimer11Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2HASYLAB at DESY, Hamburg, Germany — 3Brookhaven National Laboratory, New York, USA — 4APS at Argonne National Laboratory, Argonne, USA — 5Department of Physics, Kyoto University, Japan

Resonant x-ray diffraction at the Ru LII and LIII absorption edges was used to investigate the interplay between the spin, lattice and orbital degrees of freedom in the layered 4d-electron Ca2−xSrxRuO4 system [1]. A new orbital ordering phase transition was discovered in single-crystal compounds with Sr-doping x=0 and x=0.1 at temperatures 260 K and 130 K, respectively, at reciprocal space positions (100) and (011). The orbital order is only weakly coupled to the lattice. Its propagation vector is not affected by the change of the low-temperature antiferromagnetic structure upon Sr substitution. The tilt order of the RuO6 octahedra was also probed in our studies. It produces resonant scattering at the structurally and magnetically forbidden (110) position and follows a different temperature dependence from orbital order.

[1] I. Zegkinoglou et al., Phys. Rev. Lett. 95, 136401 (2005)

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