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Fermi surfaces and phase stability of Ba(Fe1−xMx)2As2 (M=Co,Ni,Cu,Zn)
Physical Review B
  • Suffian N. Khan, Ames Laboratory
  • Aftab Alam, Indian Institute of Technology Bombay
  • Duane D. Johnson, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
5-15-2014
DOI
10.1103/PhysRevB.89.205121
Abstract

BaFe2As2 with transition-metal doping exhibits a variety of rich phenomena from the coupling of structure, magnetism, and superconductivity. Using density functional theory, we systematically compare the Fermi surfaces (FSs), formation energies (ΔEf), and densities of states (DOSs) of electron-doped Ba(Fe1−xMx)2As2 with M={Co,Ni,Cu,Zn} in tetragonal (I4/mmm) and orthorhombic (Fmmm) structures in nonmagnetic, antiferromagnetic, and paramagnetic (disordered local moment) states. We explain changes to the phase stability (ΔEf) and Fermi surfaces (and nesting) due to chemical and magnetic disorder. We compare our results to observed/assessed properties and contrast alloy theory with the results expected from the rigid-band model. With alloying, the DOS changes from common band (Co,Ni) to split band (Cu,Zn), which dictates ΔEf and can overwhelm FS-nesting instabilities, as for the Cu and Zn cases.

Comments

This article is from Phys. Rev. B 89, 205121 (2014), doi:10.1103/PhysRevB.89.205121. Posted with permission.

Copyright Owner
American Physical Society
Language
en
File Format
application/pdf
Citation Information
Suffian N. Khan, Aftab Alam and Duane D. Johnson. "Fermi surfaces and phase stability of Ba(Fe1−xMx)2As2 (M=Co,Ni,Cu,Zn)" Physical Review B Vol. 89 Iss. 20 (2014) p. 2015121
Available at: http://works.bepress.com/duane_johnson/25/