Orbital ordering transition in Ca₂RuO₄ observed with resonant x-ray diffraction
Zegkinoglou, I. · Strempfer, J. · Nelson, C. S. · Hill, J. P. · Chakhalian, J. · Bernhard, C. · Lang, J. C. · Srajer, G. · Fukazawa, H. · Nakatsuji, S. · Maeno, Y. · Keimer, B.
Original · EN
Resonant x-ray diffraction performed at the LII and LIII absorption edges of Ru has been used to investigate the magnetic and orbital ordering in Ca₂RuO₄ single crystals. A large resonant enhancement due to electric dipole 2p→ 4d transitions is observed at the wave-vector characteristic of antiferromagnetic ordering. Besides the previously known antiferromagnetic phase transition at Tₙ=110 K, an additional phase transition, between two paramagnetic phases, is observed around 260 K. Based on the polarization and azimuthal angle dependence of the diffraction signal, this transition can be attributed to orbital ordering of the Ru t₂g electrons. The propagation vector of the orbital order is inconsistent with some theoretical predictions for the orbital state of Ca₂RuO₄.
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