Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictide Superconductors

被引：50

作者：

Nicholson, Andrew ^{[1
,2
]}

Ge, Weihao ^{[1
,2
]}

Zhang, Xiaotian ^{[1
,2
]}

Riera, Jose ^{[3
]}

Daghofer, Maria ^{[4
]}

Oles, Andrzej M. ^{[5
,6
]}

Martins, George B. ^{[7
]}

Moreo, Adriana ^{[1
,2
]}

Dagotto, Elbio ^{[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, RA-2000 Rosario, Santa Fe, Argentina

[4] IFW Dresden, D-01171 Dresden, Germany

[5] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[6] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[7] Oakland Univ, Dept Phys, Rochester, MI 48309 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 21期

关键词：

ELECTRONS;

D O I：

10.1103/PhysRevLett.106.217002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce and study an extended "t-U-J'' two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms explicitly allows us to enhance the strength of the (pi, 0)-(0, pi) spin order which favors the presence of tightly bound pairing states even in the small clusters that are here exactly diagonalized. The A(1g) and B-2g pairing symmetries are found to compete in the realistic spin-ordered and metallic regime. The dynamical pairing susceptibility additionally unveils low-lying B-1g states, suggesting that small changes in parameters may render any of the three channels stable.

引用

页数：4

共 28 条

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