Possible mechanism of Superconductivity in fe-based Superconductors
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Date
2011-06
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Addis Ababa University
Abstract
Recent discovery of superconductivity in the Iron-based layered pnictides with transition
temperature Tc ranging between 26 and 56K has generated enormous interest in
the study of these superconductors. In Iron-based superconductors (Iron-based layered
pnictides), superconductivity occurs on doping of either electrons or holes in the FeAs
layers. The Iron Fe2+, forms tetrahedron with in the layers. This means that pnictides
Fermi level is formed by 3dxy, 3dyz, or 3d zx orbitals. Very intriguing property of theses
new compounds is the rather high
exibility concerning elemental substitution, leading to
several families of superconductors, termed '1111', '122','11' and so on, depending on the
chemical composition. In this newly discovered Iron-based layered pnictides like cuprates,
has triggered challenge towards understanding the pairing mechanism.
In this work we analyze superconductivity of Iron-based superconductor. After reviewing
the current nding on this systems, we suggest phonon-exciton combined mechanism
to give a right order of supercoducting transition temperature Tc's for whole class of Fe
based superconductors
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Keywords
mechanism of Superconductivity