Quantum oscillations in the parent magnetic phase of an iron arsenide high temperature superconductor

Details Quantum oscillations in the parent magnetic phase of an iron arsenide high temperature superconductor Quantum oscillations in the parent magnetic phase of an iron arsenide high temperature superconductor

2008-06-30

arxiv.org/abs/0806.4726v2

J. Phys.: Condens. Matter 20 422203 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-8984/20/42/422203

We report quantum oscillation measurements in SrFe2As2 - which is an antiferromagnetic parent of the iron-arsenide family of superconductors - known to become superconducting under doping and the application of pressure. The magnetic field and temperature dependences of the oscillations between 20 and 55 T in the liquid helium temperature range suggest that the electronic excitations are those of a Fermi liquid. We show that the observed Fermi surface comprising small pockets is consistent with the formation of a spin-density wave. Our measurements thus demonstrate that high Tc superconductivity can occur on doping or pressurizing a conventional metallic spin-density wave state.

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