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

被引：126

作者：

Daghofer, M. ^{[1
,2
]}

Moreo, A. ^{[1
,2
]}

Riera, J. A. ^{[3
]}

Arrigoni, E. ^{[4
]}

Scalapino, D. J. ^{[5
]}

Dagotto, E. ^{[1
,2
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[3] Univ Nacl Rosario, Inst Fis Rosario, Consejo Nacl Invest Cient & Tecn, RA-2000 Rosario, Santa Fe, Argentina

[4] Graz Univ Technol, Inst Theoret & Computat Phys, A-8010 Graz, Austria

[5] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 23期

基金：

奥地利科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.237004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 B(2g) and A(2g) representations of the D(4h) group, respectively.

引用

页数：4

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