Quantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity

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dc.creatorHarrison, N.
dc.creatorMcDonald, R. D.
dc.creatorMielke, C. H.
dc.creatorBauer, E. D.
dc.creatorRonning, F.
dc.creatorThompson, J. D.
dc.date2009-02-09
dc.date.accessioned2026-07-07T12:39:31Z
dc.date.available2026-07-07T12:39:31Z
dc.descriptionWe 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.
dc.description4 pages with 5 figures
dc.identifierhttps://arxiv.org/abs/0902.1481
dc.identifierhttp://arxiv.org/abs/0902.1481
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219135
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleQuantum oscillations in antiferromagnetic CaFe2As2 on the brink of superconductivity
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