Quantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity

Details Quantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity Quantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity

2009-02-09

arxiv.org/abs/0902.1481v1

Physics

Condensed Matter

Superconductivity

4 pages with 5 figures

Scientific paper

We report quantum oscillation measurements on CaFe2As2 under strong magnetic fields- recently reported to become superconducting under pressures of as little as a kilobar. The largest observed carrier pocket occupies less than 0.05 % of the paramagnetic Brillouin zone volume- consistent with Fermi surface reconstruction caused by antiferromagnetism. On comparing several alkali earth AFe2As2 antiferromagnets (with A=Ca,Sr and Ba), the dependence of both the Fermi surface cross-sectional area F_alpha and the effective mass m*_alpha of the primary observed pocket on the antiferromagnetic/structural transition temperature T_s is found to be consistent with quasiparticles in a conventional spin-density wave model. These findings suggest that a conventional spin-density wave exists within close proximity to superconductivity in this series of compounds, which may have implications for the microscopic origin of unconventional pair formation.

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