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Phys. Rev. Lett. 101, 016404 (2008) [4 pages]

Crystal-Field Level Inversion in Lightly Mn-Doped Sr3Ru2O7

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M. A. Hossain1, Z. Hu2, M. W. Haverkort2, T. Burnus2, C. F. Chang2, S. Klein2, J. D. Denlinger3, H.-J. Lin4, C. T. Chen4, R. Mathieu5, Y. Kaneko5, Y. Tokura5, S. Satow6, Y. Yoshida7, H. Takagi6, A. Tanaka8, I. S. Elfimov1, G. A. Sawatzky1, L. H. Tjeng2, and A. Damascelli1,*
1Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
2II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
4National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
5Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
6Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
7National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8568, Japan
8Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

Received 15 January 2008; published 3 July 2008

Sr3(Ru1-xMnx)2O7, in which 4d-Ru is substituted by the more localized 3d-Mn, is studied by x-ray dichroism and spin-resolved density functional theory. We find that Mn impurities do not exhibit the same 4+ valence of Ru, but act as 3+ acceptors; the extra eg electron occupies the in-plane 3dx2-y2 orbital instead of the expected out-of-plane 3d3z2-r2. We propose that the 3d-4d interplay, via the ligand oxygen orbitals, is responsible for this crystal-field level inversion and the material’s transition to an antiferromagnetic, possibly orbitally ordered, low-temperature state.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.016404
DOI:
10.1103/PhysRevLett.101.016404
PACS:
71.30.+h, 71.70.Ch, 78.70.Dm

*damascelli@physics.ubc.ca

 
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