Wednesday, June 12, 2013

1306.2603 (Ping-Hui Lin et al.)

Nature of the bad metallic behavior of Fe_{1.06}Te inferred from its
evolution in the magnetic state

Ping-Hui Lin, Y. Texier, A. Taleb-Ibrahimi, P. Le Fèvre, F. Bertran, E. Giannini, M. Grioni, V. Brouet
We investigate with angle resolved photoelectron spectroscopy the change of the Fermi Surface (FS) and the main bands from the paramagnetic (PM) state to the antiferromagnetic (AFM) occurring below 72 K in Fe_{1.06}Te. The evolution is completely different from that observed in iron-pnictides as nesting is absent. The AFM state is a rather good metal, in agreement with our magnetic band structure calculation. On the other hand, the PM state is very anomalous with a large pseudogap on the electron pocket that closes in the AFM state. We discuss this behavior in connection with spin fluctuations existing above the magnetic transition and the correlations predicted in the spin-freezing regime of the incoherent metallic state.
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