Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.101.237004· OSTI ID:961783

Daghofer, Maria ^[1]; Moreo, Adriana ^[1]; Riera, J. A. ^[2]; Arrigoni, E. ^[3]; Scalapino, D. J. ^[4]; Dagotto, Elbio R ^[1]

---

1. ORNL
2. Universidad Nacional de Rosario
3. Insitut fur Theoretische Physik, Association EURATOM, Graz, Austria
4. University of California, Santa Barbara

A two-orbital model for Fe-pnictide superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, or by band structure fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A spin striped state is stable in a broad range of couplings in the undoped regime, in agreement with neutron scattering. Adding two electrons to the undoped ground state of a small cluster, the dominant pairing operators are found. Depending on the parameters, two pairing operators were identified: they involve inter-xz-yz orbital combinations forming spin singlets or triplets, transforming according to the B2g and A2g representations of the D4h group, respectively.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 961783
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COUPLINGS
ELECTRONS
GROUND STATES
INTEGRALS
IRON
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
PAIRING INTERACTIONS
PNICTIDES
SCATTERING
SIMULATION
SPIN
SUPERCONDUCTORS
TRIPLETS
TWO-DIMENSIONAL CALCULATIONS