High-energy spin excitations in BaFe2As2 observed by inelastic neutron scattering

被引：113

作者：

Ewings, R. A. ^{[1
]}

Perring, T. G. ^{[1
]}

Bewley, R. I. ^{[1
]}

Guidi, T. ^{[1
]}

Pitcher, M. J. ^{[2
]}

Parker, D. R. ^{[2
]}

Clarke, S. J. ^{[2
]}

Boothroyd, A. T. ^{[3
]}

机构：

[1] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[2] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 22期

基金：

英国工程与自然科学研究理事会;

关键词：

antiferromagnetic materials; barium compounds; iron compounds; neutron diffraction; spin fluctuations;

D O I：

10.1103/PhysRevB.78.220501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report neutron-scattering measurements of cooperative spin excitations in antiferromagnetically ordered BaFe2As2, the parent phase of an iron pnictide superconductor. The data extend up to similar to 100 meV and show that the spin excitation spectrum is sharp and highly dispersive. By fitting the spectrum to a linear spin-wave model we estimate the magnon bandwidth to be in the region of 0.17 eV. The large characteristic spin-fluctuation energy suggests that magnetism could play a role in the formation of the superconducting state.

引用

页数：4

共 29 条

[1]

ALIREZA PL, J PHYS CONDENS UNPUB

[2]

[Anonymous], ARXIV08062652

[3] MERLIN, a new high count rate spectrometer at ISIS [J].

Bewley, R. I. ;

Eccleston, R. S. ;

McEwen, K. A. ;

Hayden, S. M. ;

Dove, M. T. ;

Bennington, S. M. ;

Treadgold, J. R. ;

Coleman, R. L. S. .

PHYSICA B-CONDENSED MATTER, 2006, 385-86 :1029-1031

[4] Is LaFeAsO1-xFx an electron-phonon superconductor? [J].

Boeri, L. ;

Dolgov, O. V. ;

Golubov, A. A. .

PHYSICAL REVIEW LETTERS, 2008, 101 (02)

[5]

CHRISTIANSON AD, ARXIV08073932

[6] Multiband magnetism and superconductivity in Fe-based compounds [J].

Cvetkovic, V. ;

Tesanovic, Z. .

EPL, 2009, 85 (03)

[7] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[8] Competing orders and spin-density-wave instability in La(O1-xFx) FeAs [J].

Dong, J. ;

Zhang, H. J. ;

Xu, G. ;

Li, Z. ;

Li, G. ;

Hu, W. Z. ;

Wu, D. ;

Chen, G. F. ;

Dai, X. ;

Luo, J. L. ;

Fang, Z. ;

Wang, N. L. .

EPL, 2008, 83 (02)

[9] Correlated electronic structure of LaO1-xFxFeAs [J].

Haule, K. ;

Shim, J. H. ;

Kotliar, G. .

PHYSICAL REVIEW LETTERS, 2008, 100 (22)

[10]

HUANG Q, ARXIV08062776

← 1 2 3 →