Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

Details Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

2010-09-24

arxiv.org/abs/1009.4911v1

Physics

Condensed Matter

Superconductivity

9 pages, 10 figures, submitted to Phys. Rev. B

Scientific paper

We show using a combination of powder X-ray and neutron diffraction, first principles calculations, temperature- and field-dependent magnetization, heat capacity and resistivity data that the superconducting behavior of `Sr$_4$V$_2$O$_6$Fe$_2$As$_2$' is dependent on synthesis conditions, particularly, heating profiles result in unintentional chemical doping. This compound can be tuned from a state in which the vanadium electrons are itinerant with a high electronic density of states, to a state where the vanadium-oxide layers are insulating and presumably antiferromagnetic.

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