Evidence for Dirac nodes from quantum oscillations in SrFe2As2

Sutherland, Mike and Hills, D. J. and Tan, B. S. and Altarawneh, M. M. and Harrison, N. and Gillett, J. and O'Farrell, E. C. T. and Benseman, T. M. and Kokanović, Ivan and Syers, P. and Cooper, J. R. and Sebastian, Suchitra E. (2011) Evidence for Dirac nodes from quantum oscillations in SrFe2As2. Physical Review B, 84 (18). pp. 180506-5. ISSN 1098-0121

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We present a detailed study of quantum oscillations in the antiferromagnetically ordered pnictide compound SrFe2As2 as the angle between the applied magnetic field and crystalline axes is varied. Our measurements were performed on high-quality single crystals in a superconducting magnet, and in pulsed magnetic fields up to 60 T, allowing us to observe orbits from several small Fermi-surface pockets. We extract the cyclotron effective mass m☆ and frequency F for these orbits and track their values as the field is rotated away from the c axis. While a constant ratio of m☆/F is expected for a parabolic band, we observe deviations from this behavior. We conclude that this observation points to orbits derived from a band with Dirac dispersion near the Fermi level.

Item Type: Article
Keywords: pnictide compound SrFe2As2, quantum oscillations, Dirac Nodes
Date: November 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1008
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jun 2014 07:38
Last Modified: 24 Feb 2016 15:01
URI: http://digre.pmf.unizg.hr/id/eprint/2055

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