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Phys. Rev. Lett. 101, 026407 (2008) [4 pages]

Fermi Surface and van Hove Singularities in the Itinerant Metamagnet Sr3Ru2O7

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A. Tamai1,*, M. P. Allan1, J. F. Mercure1, W. Meevasana2, R. Dunkel2, D. H. Lu2, R. S. Perry3, A. P. Mackenzie1, D. J. Singh4, Z.-X. Shen2, and F. Baumberger1
1Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
2Departments of Applied Physics and Physics, and Stanford Synchrotron Radiation Laboratory (SSRL), Stanford University, Stanford, California 94305, USA
3Scottish Universities Physics Alliance, School of Physics and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, United Kingdom
4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA

Received 6 March 2008; published 11 July 2008

The low-energy electronic structure of the itinerant metamagnet Sr3Ru2O7 is investigated by angle-resolved photoemission and density-functional calculations. We find well-defined quasiparticle bands with resolution-limited linewidths and Fermi velocities up to an order of magnitude lower than in single layer Sr2RuO4. The complete topography, the cyclotron masses, and the orbital character of the Fermi surface are determined, in agreement with bulk sensitive de Haas–van Alphen measurements. An analysis of the dxy band dispersion reveals a complex density of states with van Hove singularities near the Fermi level, a situation which is favorable for magnetic instabilities.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.026407
DOI:
10.1103/PhysRevLett.101.026407
PACS:
71.18.+y, 71.20.−b, 75.30.Kz, 79.60.−i

*anna.tamai@st-andrews.ac.uk

See Also

See Also: M. W. Haverkort, I. S. Elfimov, L. H. Tjeng, G. A. Sawatzky, and A. Damascelli, Strong Spin-Orbit Coupling Effects on the Fermi Surface of Sr2RuO4 and Sr2RhO4, Phys. Rev. Lett. 101, 026406 (2008).

See Also: Guo-Qiang Liu, V. N. Antonov, O. Jepsen, and O. K. Andersen., Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4 Puzzle, Phys. Rev. Lett. 101, 026408 (2008).

 
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