Competing Magnetic Phases in Ba(Fe$_{0.925}$Mn$_{0.075}$)$_2$As$_2$

ORAL

Abstract

Inelastic neutron scattering measurements on Ba(Fe$_{0.925}$Mn$_{0.075}$)$_2$As$_2$ show broad, diffusive spin fluctuations at two different propagation vectors corresponding to stripe magnetic order and conventional N\'eel antiferromagnetic order. Below {\it T} = 80\,K long-range stripe magnetic ordering occurs and sharp spin wave excitations appear at the stripe propagation vector while diffusive spin fluctuations remain at the N\'eel propagation vector. These results suggest that low concentrations of Mn dopants introduce a competing magnetic phase that may prevent the development of superconductivity in Ba(Fe$_{1-x}$Mn$_{x}$)$_2$As$_2$.

*The work at the Ames Laboratory was supported by US DOE, Office of Basic Energy Sciences, DMSE, contract DE-AC02-07CH11358.

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Authors

  • G.S. Tucker

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • D.K. Pratt

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • M.G. Kim

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • S. Ran

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • A. Thaler

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • G.E. Granroth

    • Oak Ridge National Laboratory

  • K. Marty

    • Oak Ridge National Laboratory

  • W. Tian

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • J.L. Zarestky

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • S.L. Bud'ko

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • P.C. Canfield

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • A. Kreyssig

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • A.I. Goldman

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University

  • R.J. McQueeney

    • Ames Laboratory and Department of Physics \& Astronomy, Iowa State University