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Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2

TitleStripe Antiferromagnetic Spin Fluctuations in SrCo2As2
Publication TypeJournal Article
Year of Publication2013
AuthorsJayasekara, W, Lee, Y, Pandey, A, Tucker, GS, Sapkota, A, Lamsal, J, Calder, S, Abernathy, DL, Niedziela, JL, Harmon, BN, Kreyssig, A, Vaknin, D, Johnston, DC, Goldman, AI, McQueeney, RJ
JournalPhysical Review Letters
Date Published10
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000325371500010

Inelastic neutron scattering measurements of paramagnetic SrCo2As2 at T = 5 K reveal antiferromagnetic (AFM) spin fluctuations that are peaked at a wave vector of Q(AFM) = (1/2, 1/2, 1) and possess a large energy scale. These stripe spin fluctuations are similar to those found in AFe(2)As(2) compounds, where spin-density wave AFM is driven by Fermi surface nesting between electron and hole pockets separated by Q(AFM). SrCo2As2 has a more complex Fermi surface and band-structure calculations indicate a potential instability toward either a ferromagnetic or stripe AFM ground state. The results suggest that stripe AFM magnetism is a general feature of both iron and cobalt-based arsenides and the search for spin fluctuation-induced unconventional superconductivity should be expanded to include cobalt-based compounds.

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Complex States

Short TitlePhys. Rev. Lett.