An EXAFS analysis of topological HTSC phase transition in iron-oxypnictides

M.C. Shah, TANVEER AHMED WANI, Abdul Gaffar lone, Irshad Ahmed Mir, TARA PRASAD, Aijaz Ahmed Bhat, Sourabh Saxena, Kuljeet Singh, Sudarshan Parihar, Sunil Kumar Ahirwar, Sajad Mustafa, Hilal Ahmed, Chering Namgyal, Aslam A.M and Anoop Parsai Department of Physics, UTD Barkatullah University, Bhopal - 462 026 (India).

Received on March 10, 2010 and accepted on April 18, 2010

ABSTRACT

The extended x-ray absorption fine structure (EXAFS) spectroscopic analysis of correlated electronic-structures of high phase transition temperature (Tc) superconducting iron-oxypnictides (HTSCIO) provides the carrier density, coherent metal, spin density wave (SDW) ordering state by tuning the chemical potential or Fermi level (EF) with alio/isovalent cationic dopants to yield the occurrence of shape resonance in dimensional 2D-3D (Fe3d-As2p (dp) 3z2r2 and x2y2 orbitals character bands crossover topology of Fermi surface (FS) in metal heterostructures at atomic limits (MEHAL) of cationic periodic lattice distortion (PLD) due to quantum wells (Q-dots) in layered structure superlattice.

Keywords : EXAFS, Tc, HTSCIO, SDW, Topology, FS, MEHAL.