Neutron scattering resonance and the iron-pnictide superconducting gap

被引：125

作者：

Maier, T. A. ^{[1
,2
]}

Graser, S. ^{[3
]}

Scalapino, D. J. ^{[4
]}

Hirschfeld, P. ^{[5
]}

机构：

[1] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA

[3] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

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

[5] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 13期

关键词：

BCS theory; Brillouin zones; Fermi surface; iron compounds; neutron diffraction; RPA calculations; superconducting energy gap; superconducting materials;

D O I：

10.1103/PhysRevB.79.134520

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The existence of a neutron scattering resonance at a wave vector q(*) implies a sign change of the gap between two Fermi-surface regions separated by wave vector q(*). For the Fe pnictides, a resonance has been observed for a wave vector q(*) which connects a hole Fermi surface around the Gamma point with an electron Fermi surface around the X or Y points of the 1 Fe/unit cell Brillouin zone. Here we study the neutron scattering resonance for a five-orbital model within a random-phase approximation-BCS approximation. Our results show that both an isotropic sign-switched and an anisotropic extended s-wave gap are consistent with the present data for q(*) near (pi,0) and that scattering at other momentum transfers can be useful in distinguishing between gap structures.

引用

页数：5

共 23 条

[1] 19F NMR investigation of the iron pnictide superconductor LaFeAsO0.89F0.11 [J].

Ahilan, K. ;

Ning, F. L. ;

Imai, T. ;

Sefat, A. S. ;

Jin, R. ;

McGuire, M. A. ;

Sales, B. C. ;

Mandrus, D. .

PHYSICAL REVIEW B, 2008, 78 (10)

[2] Neutron scattering from a collective spin fluctuation mode in a CuO2 bilayer [J].

Bulut, N ;

Scalapino, DJ .

PHYSICAL REVIEW B, 1996, 53 (09) :5149-5152

[3] WEAK-COUPLING ANALYSIS OF THE NEUTRON-SCATTERING SPECTRAL WEIGHT [J].

BULUT, N ;

SCALAPINO, DJ .

PHYSICAL REVIEW B, 1993, 47 (06) :3419-3422

[4] Proximity of antiferromagnetism and superconductivity in LaFeAsO1-xFx:: Effective Hamiltonian from ab initio studies [J].

Cao, Chao ;

Hirschfeld, P. J. ;

Cheng, Hai-Ping .

PHYSICAL REVIEW B, 2008, 77 (22)

[5] Unconventional superconductivity in Ba0.6K0.4Fe2As2 from inelastic neutron scattering [J].

Christianson, A. D. ;

Goremychkin, E. A. ;

Osborn, R. ;

Rosenkranz, S. ;

Lumsden, M. D. ;

Malliakas, C. D. ;

Todorov, I. S. ;

Claus, H. ;

Chung, D. Y. ;

Kanatzidis, M. G. ;

Bewley, R. I. ;

Guidi, T. .

NATURE, 2008, 456 (7224) :930-932

[6] Magnetism, superconductivity, and pairing symmetry in iron-based superconductors [J].

Chubukov, A. V. ;

Efremov, D. V. ;

Eremin, I. .

PHYSICAL REVIEW B, 2008, 78 (13)

[7] The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors [J].

Eschrig, M .

ADVANCES IN PHYSICS, 2006, 55 (1-2) :47-183

[8] 75As NMR studies of superconducting LaFeAsO0.9F0.1 [J].

Grafe, H. -J. ;

Paar, D. ;

Lang, G. ;

Curro, N. J. ;

Behr, G. ;

Werner, J. ;

Hamann-Borrero, J. ;

Hess, C. ;

Leps, N. ;

Klingeler, R. ;

Buechner, B. .

PHYSICAL REVIEW LETTERS, 2008, 101 (04)

[9] Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides [J].

Graser, S. ;

Maier, T. A. ;

Hirschfeld, P. J. ;

Scalapino, D. J. .

NEW JOURNAL OF PHYSICS, 2009, 11

[10]

IKEDA H, 2008, J PHYS SOC JPN, V77, P2008

← 1 2 3 →