Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

Athena S. Sefat; David J. Singh; V. Ovidiu Garlea; Yuri L. Zuev; Michael A. McGuire; Lindsay VanBebber; Brian C. Sales

Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

Superconductivity 2010-09-27 v1

Authors: Athena S. Sefat , David J. Singh , V. Ovidiu Garlea , Yuri L. Zuev , Michael A. McGuire , Lindsay VanBebber , Brian C. Sales

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Abstract

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.

Keywords

Sr4V2O6Fe2As2 chemical stoichiometry superconductivity first-principles calculations vanadium oxide layers itinerant electrons antiferromagnetism

Cite

@article{arxiv.1009.4911,
  title  = {Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry},
  author = {Athena S. Sefat and David J. Singh and V. Ovidiu Garlea and Yuri L. Zuev and Michael A. McGuire and Lindsay VanBebber and Brian C. Sales},
  journal= {arXiv preprint arXiv:1009.4911},
  year   = {2010}
}

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

Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry

Abstract

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