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.

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.

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

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