Fermi surface and van Hove singularity in the itinerant metamagnet Sr3Ru2O7

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.101.026407· OSTI ID:968254

Tamai, A. ^[1]; Allan, M. P. ^[1]; Mercure, W ^[2]; Meevasana, W. ^[2]; Dunkel, R ^[2]; Lu, D. H. ^[2]; Perry, R. S. ^[3]; Mackenzie, A. P. ^[3]; Singh, David J ^[4]; Shen, Z. X. ^[2]; Baumberger, F. ^[2]

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1. University of St. Andrews, Scotland
2. Stanford University
3. University of St. Andrews, St. Andrews, Fife, United Kingdom
4. ORNL

The low-energy electronic structure of the itinerant metamagnet Sr{sub 3}Ru{sub 2}O{sub 7} 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 Sr{sub 2}RuO{sub 4}. 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 d{sub xy} band dispersion reveals a complex density of states with van Hove singularities near the Fermi level, a situation which is favorable for magnetic instabilities.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 968254
• Journal Information: Physical Review Letters, Vol. 101, Issue 2; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CYCLOTRONS
ELECTRONIC STRUCTURE
FERMI LEVEL
PHOTOEMISSION
SINGULARITY
TOPOGRAPHY