Quantum dynamical screening of the local magnetic moment in Fe-based superconductors

Details Quantum dynamical screening of the local magnetic moment in Fe-based superconductors Quantum dynamical screening of the local magnetic moment in Fe-based superconductors

2011-12-13

arxiv.org/abs/1112.3002v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

We have calculated the local magnetic susceptibility of one of the prototypical Fe-based superconductors (LaFeAsO) by means of the local density approximation + dynamical mean field theory as a function of both (imaginary) time and real frequencies with and without vertex corrections. Vertex corrections appear essential for obtaining the correct $\omega$-dependence, in particular a pronounced low-energy peak at $\omega \sim 0.2\,$eV, which we ascribe to the screening of the Fe local magnetic moments. For short times ($\omega$-integrated or equal-time susceptibility), we find a considerably large local magnetic moment, whereas this is well screened over longer time-scales (small $\omega$) due to local quantum fluctuations. In the paramagnetic phase, both short-time local magnetic moment and long-time magnetic moment show a temperature dependence much weaker than the Curie-like one. Except for x-ray absorption spectroscopy (XAS), typically the long-time moment or susceptibility is measured in experiments. For instance, according to our findings, the frequency range of typical neutron experiments would be too limited to directly estimate the magnitude of the short-time moment, and particular care should be taken when performing high frequency extrapolations.

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