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Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

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.

preprint2010arXivOpen access
Athena S. SefatDavid J. SinghV. Ovidiu GarleaYuri L. ZuevMichael A. McGuireLindsay VanBebberBrian C. Sales
cond-mat.supr-con
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Athena S. SefatDavid J. SinghV. Ovidiu GarleaYuri L. ZuevMichael A. McGuireLindsay VanBebberBrian C. Sales

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