Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2

Date
2012-07-01
Authors
Tucker, G. S.
Pratt, D. K.
Kim, M. G.
Canfield, Paul
Ran, S.
Thaler, A.
Granroth, G. E.
Marty, K.
Tian, W.
Zarestky, J. L.
Lumsden, M. D.
Bud’ko, Sergey
Canfield, Paul
Kreyssig, Andreas
Goldman, Alan
McQueeney, Robert
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Ames Laboratory
Organizational Unit
Physics and Astronomy
Organizational Unit
Journal Issue
Series
Department
Ames LaboratoryPhysics and Astronomy
Abstract

Inelastic neutron scattering measurements on Ba(Fe0.925Mn0.075)(2)As-2 manifest spin fluctuations at two different wave vectors, Q(stripe) = (1/2,1/2,1) and Q(Neel) = (1,0,1), corresponding to the expected stripe spin-density wave order and checkerboard antiferromagnetic order in the tetragonal I4/mmm cell, respectively. Below T-N = 80 K, long-range stripe magnetic ordering occurs and sharp spin wave excitations appear at Q(stripe) while broad and diffusive spin fluctuations remain at Q(Neel) at all temperatures. Low concentrations of Mn dopants nucleate local moment spin fluctuations at Q(Neel) that compete with itinerant spin fluctuations at Q(stripe) and may disrupt the development of superconductivity.

Comments

This article is published as Tucker, Gregory S., Daniel K. Pratt, Min Gyu Kim, Sheng Ran, Alexander Thaler, G. E. Granroth, K. Marty et al. "Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe 2 As 2." Physical Review B 86, no. 2 (2012): 020503. DOI: 10.1103/PhysRevB.86.020503. Posted with permission.

Description
Keywords
Citation
DOI
Collections