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

TitleCompetition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
Publication TypeJournal Article
Year of Publication2012
AuthorsTucker GS, Pratt DK, Kim MG, Ran S, Thaler A, Granroth GE, Marty K, Tian W, Zarestky JL, Lumsden MD, Bud'ko SL, Canfield PC, Kreyssig A, Goldman AI, McQueeney RJ
Journal TitlePhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000306409000001
Keywordsneutron-scattering, spin excitations, superconductivity

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.

URL<Go to ISI>://WOS:000306409000001
Alternate JournalPhys. Rev. B