Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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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.
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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.