Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
G. S. Tucker, D. K. Pratt, M. G. Kim, S. Ran, A. Thaler, G. E., Granroth, K. Marty, W. Tian, J. L. Zarestky, M. D. Lumsden, S. L. Bud'ko, P., C. Canfield, A. Kreyssig, A. I. Goldman, and R. J. McQueeney
TL;DR
This study investigates how Mn doping in BaFe2As2 influences magnetic instabilities, revealing a competition between stripe and checkerboard orders that affects magnetic and superconducting properties.
Contribution
It provides experimental evidence of competing magnetic orders in Mn-doped BaFe2As2 and their impact on magnetic excitations and potential superconductivity.
Findings
Long-range stripe magnetic order develops below 80 K.
Mn doping induces local moment fluctuations at (1/2,1/2).
Competing magnetic fluctuations may hinder superconductivity.
Abstract
Inelastic neutron scattering measurements on Ba(Fe0.925Mn0.075)2As2 manifest spin fluctuations at two different wavevectors in the Fe square lattice, (1/2,0) and (1/2,1/2), corresponding to the expected stripe spin-density wave order and checkerboard antiferromagnetic order, respectively. Below T_N=80 K, long-range stripe magnetic ordering occurs and sharp spin wave excitations appear at (1/2,0) while broad and diffusive spin fluctuations remain at (1/2,1/2) at all temperatures. Low concentrations of Mn dopants nucleate local moment spin fluctuations at (1/2,1/2) that compete with itinerant spin fluctuations at (1/2,0) and may disrupt the development of superconductivity.
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