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Phys. Rev. Lett. 101, 216402 (2008) [4 pages]

Fermi Surface of Superconducting LaFePO Determined from Quantum Oscillations

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A. I. Coldea1, J. D. Fletcher1, A. Carrington1, J. G. Analytis2, A. F. Bangura1, J.-H. Chu2, A. S. Erickson2, I. R. Fisher2, N. E. Hussey1, and R. D. McDonald3
1H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, United Kingdom
2Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA
3National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA

Received 4 September 2008; published 20 November 2008

We report extensive measurements of quantum oscillations in the normal state of the Fe-based superconductor LaFePO, (Tc∼6  K) using low temperature torque magnetometry and transport in high static magnetic fields (45 T). We find that the Fermi surface is in broad agreement with the band-structure calculations with the quasiparticle mass enhanced by a factor ∼2. The quasi-two-dimensional Fermi surface consists of nearly nested electron and hole pockets, suggesting proximity to a spin or charge density wave instability.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.216402
DOI:
10.1103/PhysRevLett.101.216402
PACS:
71.18.+y, 74.25.Jb, 74.70.−b
 
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