Anomalous Magnetic Susceptibility in Iron Pnictides: Paramagnetic Phase

Details Anomalous Magnetic Susceptibility in Iron Pnictides: Paramagnetic Phase Anomalous Magnetic Susceptibility in Iron Pnictides: Paramagnetic Phase

2009-03-22

arxiv.org/abs/0903.3732v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 eps figures, submitted to PRB

Scientific paper

Observation of an anomalous temperature dependence of the spin susceptibility, along with a spin gap in NMR, in the quantum paramagnetic normal state of Iron Pnictides is a signature of an unusual metallic state. We argue that both these anomalous features are associated with a wide fluctuational regime dominated by dynamical, short-ranged and frustrated spin correlations in a strongly correlated metal. Using LDA+DMFT, we show that both these features can be quantitatively undertstood in the doped Fe-pnictides. We argue that such spin correlations naturally arise in a Mottness scenario, where an effective, dualistic description involves coexisting renormalized quasiparticles and effectively localized moments, arising from the same set of d bands.

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