Abstract
We present a comparative study of the electronic structure of pure, Co-doped, and Ni-doped BaFe2As2. The calculations were performed by the embedded cluster method at the electron correlation level (ECM-MP2). The orbital population analysis reveals that doping with Co or Ni introduces, in both cases, a considerable transfer of charge from cations toward the anions and a transfer of spin density in the opposite direction that reflects an independence of spin and charge in non-relativistic approach. In both doping, we note the presence of spinless electron on the 3d orbitals. On the other hand, both doping cases differ in the local magnetic order: Co induces a local antiferromagnetic order along the b axis of the crystalline structure, while Ni maintains the ferromagnetic order along this axis. In the Co-doped compound, the frustration of magnetic state and formation of spinless electrons correspond to some properties of the Anderson RVB model of superconductivity.
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The authors thank the DGTIC computer staff for providing access to the MITZLI clusters of Universidad Nacional Autonoma of México.
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Soullard, J., Kaplan, I.G. Comparative Study of the Magnetic Structure of BaFe2As2 Doped with Co or Ni. J Supercond Nov Magn 29, 3147–3154 (2016). https://doi.org/10.1007/s10948-016-3626-8
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DOI: https://doi.org/10.1007/s10948-016-3626-8