Stripe Antiferromagnetic Spin Fluctuations in SrCo₂As₂

Journal Article · Tue Oct 01 04:00:00 EDT 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.111.157001· OSTI ID:1127461

Jayasekara, Wageesha ^[1]; Lee, Young-Jin ^[1]; Pandey, Abhishek ^[1]; Tucker, Gregory ^[1]; Sapkota, Aashish ^[1]; Lamsal, J. ^[1]; Calder, S. ^[2]; Abernathy, D. L. ^[2]; Niedziela, J. L. ^[2]; Harmon, Bruce ^[1]; Kreyssig, Andreas ^[1]; Vaknin, David ^[1]; Johnston, David ^[1]; Goldman, A. I. ^[1]; McQueeney, R. J. ^[1]

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1. Ames Laboratory (AMES) and Iowa State Univ., Ames, IA (United States)
2. Oak Ridge National Laboratory, Oak Ridge, TN (United States)

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 AFe₂As₂ 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.

• Research Organization: Ames Laboratory (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11358
• OSTI ID: 1127461
• Report Number(s): IS-T--8161
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 111; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY