Title
Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)(2)As-2
Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
10-1-2010
Journal or Book Title
Physical Review B
Volume
82
Issue
14
First Page
140503(R)
DOI
10.1103/PhysRevB.82.140503
Abstract
Inelastic neutron scattering from superconducting (SC) Ba(Fe0.926Co0.074)2As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to QAFM=(1212) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1−J2 model with J1/J2∼1. The spin resonance at ∼8.3 meV in the SC state displays the same anisotropy. The anisotropic fluctuations experimentally evolve into two distinct maxima only along the direction transverse to QAFM above ∼80 meV indicating unusual quasipropagating excitations.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Li, H.-F.; Broholm, C.; Vaknin, David; Fernandes, R. M.; Abernathy, D. L.; Stone, M. B.; Pratt, D. K.; Tian, W.; Qiu, Y.; Ni, Ni; Diallo, S. O.; Zarestky, J. L.; Bud’ko, Sergey L.; Canfield, Paul C.; and McQueeney, Robert J., "Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)(2)As-2" (2010). Physics and Astronomy Publications. 699.
https://lib.dr.iastate.edu/physastro_pubs/699
Comments
This article is published as Li, H-F., Collin Broholm, David Vaknin, Rafael M. Fernandes, D. L. Abernathy, M. B. Stone, D. K. Pratt, W. Tian, Y. Qiu, N. Ni, S. O. Diallo, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, and R. J. McQueeney. "Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe 0.926 Co 0.074) 2 As 2." Physical Review B 82, no. 14 (2010): 140503(R). DOI: 10.1103/PhysRevB.82.140503.