Orbital Ordering Transition in Ca{sub 2}RuO{sub 4} Observed with Resonant X-Ray Diffraction
Journal Article
·
· Physical Review Letters
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart (Germany)
- National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)
Resonant x-ray diffraction performed at the L{sub II} and L{sub III} absorption edges of Ru has been used to investigate the magnetic and orbital ordering in Ca{sub 2}RuO{sub 4} single crystals. A large resonant enhancement due to electric dipole 2p{yields}4d transitions is observed at the wave-vector characteristic of antiferromagnetic ordering. Besides the previously known antiferromagnetic phase transition at T{sub N}=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 t{sub 2g} electrons. The propagation vector of the orbital order is inconsistent with some theoretical predictions for the orbital state of Ca{sub 2}RuO{sub 4}.
- OSTI ID:
- 20696505
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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