Coexistence of superconductivity and magnetism in CaK(Fe1-xNix)4As4 as probed by 57Fe Mössbauer spectroscopy

ORAL

Abstract

Temperature dependent 57Fe Mössbauer spectroscopy and specific heat measurements for CaK(Fe1-xNix)4As4 with x = 0, 0.017, 0.033, and 0.049 are presented. No magnetic hyperfine field (i.e. no static magnetic order) was detected down to 5.5 K for x = 0 and 0.017 in agreement with the absence of any additional feature below superconducting transition temperature, Tc, in the specific heat data. The evolution of magnetic hyperfine field with temperature was studied for x = 0.033 and 0.049. The long-range magnetic order in these two compounds coexists with superconductivity. The magnetic hyperfine field, Bhf, (ordered magnetic moment) below Tc in CaK(Fe0.967Ni0.033)4As4 is continuously suppressed with the developing superconducting order parameter. The Bhf(T) data for CaK(Fe0.967Ni0.033)4As4, and CaK(Fe0.951Ni0.049)4As4 can be described by Machida's model for coexistence of itinerant spin density wave magnetism and superconductivity [K. Machida, J. Phys. Soc. Jpn. 50, 2195 (1981)].

–

Presenters

  • Sergey Budko

    Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Physics, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory

Authors

  • Sergey Budko

    Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Physics, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory

  • Vladimir G. Kogan

    Ames Laboratory, Iowa State University, Ames Laboratory

  • Ruslan Prozorov

    Ames Laboratory US DOE, Ames, Iowa, Iowa State University, Ames Laboratory, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University, USA, Ames Laboratory and Iowa State University, Ames, IA, USA, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA

  • William Meier

    Ames Laboratory and Dept. of Physics, Iowa State University, Ames Laboratory, Iowa State University, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Iowa State University and Ames Laboratory, Ames Laboratory & Department of Physics, Iowa State University

  • Mingyu Xu

    Ames Laboratory, Iowa State University, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory & Iowa State University, Iowa State University and Ames Laboratory

  • Paul Canfield

    Ames Laboratory and Dept. of Physics, Iowa State University, Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA., Ames Laboratory, Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University, Iowa State University and Ames Laboratory, Ames Laboratory and Iowa State University, Ames, IA, USA, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Department of Physics & Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory, Physics, Iowa State University/Ames Laboratory, Ames Laboratory & Iowa State University, Physics, Iowa State University