Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition

Details Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition

2008-10-17

arxiv.org/abs/0810.3068v2

Phys. Rev. B 79, 092416 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.092416

We present a detailed description of the dynamics of the magnetic modes in the recently discovered superconducting pnictides using reliable self-consistent spin-wave theory and series expansion. Contrary to linear spin-wave theory, no gapless mode occurs at the N\'eel wave vector. We discuss the scenario that the static magnetic moment is strongly reduced by magnetic fluctuations arising from the vicinity to a quantum phase transition. Smoking gun experiments to verify this scenario are proposed and possible results are predicted. Intriguingly in this scenario, the structural transition at finite temperature would be driven by an Ising transition in directional degrees of freedom.

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