Proximity of Iron Pnictide Superconductors to a Quantum Tricritical Point

Abstract

We determine the nature of the magnetic quantum critical point in the doped LaFeAsO using a set of constrained density functional calculations that provide ab initio coefficients for a Landau order parameter analysis. The system turns out to be remarkably close to a quantum tricritical point, where the nature of the phase transition changes from first to second order. We compare with the effective field theory and discuss the experimental consequences.

4 pages, 4 figures

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• A neutron scattering study of the under-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, x=0.09 and 0.17 self-flux grown single crystals and the universality of the tricritical point
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