Quantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity
Abstract
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 alkaline earth AFe2As2 antiferromagnets (with A = Ca, Sr and Ba), the dependences of the Fermi surface cross-sectional area Fα and the effective mass mα* of the primary observed pocket on the antiferromagnetic/structural transition temperature Ts are both found to be consistent with the case for quasiparticles in a conventional spin-density wave model. These findings suggest that the recently proposed strain-enhanced superconductivity in these materials occurs within a broadly conventional spin-density wave phase.
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