Complex Magnetic behavior in CeGe$_{1.76}$ Single Crystals observed by Neutron Diffraction at Low Temperatures

ORAL

Abstract

Magnetization measurements on CeGe$_{1.76}$ single crystals indicate two apparent magnetic transitions around 4 K and 7 K. A neutron diffraction experiment was performed at the instrument HB-1A, to study the magnetic order in detail and results will be discussed in this report. Surprisingly, several transitions have been observed: Below 7 K, incommensurate antiferromagnetic order appears with a propagation vector close to (0~0~0.25), that becomes commensurate below 5.2 K demonstrating a lock-in transition. Moreover, squaring-up behavior was also observed by the occurrence of higher harmonic Bragg peaks. An additional antiferromagnetic order was seen below 4.0 K by half-integer and integer indexed Bragg peaks. Further experiments are needed to verify the directions of the ordered magnetic moments.

*This research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358.

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Authors

  • Wageesha Jayasekara

    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Wei Tian

    • Oak Ridge National Laboratory (High Flux Isotope Reactor)
    • HFIR, Oak Ridge National Laboratory

  • Andreas Kreyssig

    • Ames Laboratory and Iowa State University
    • Ames Lab., Iowa State Univ., IA
    • Ames Laboratory/ Iowa State University
    • Iowa State University
    • Ames Laboratory, Dept. Physics Astronomy, Iowa State University
    • The Ames Laboratory, Iowa State University, Ames, USA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Halyna Hodovanets

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • S.L. Bud'ko

    • Ames Laboratory
    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Iowa State University, Ames Lab
    • Ames Laboratory/ Iowa State University
    • The Ames Laboratory, Ames, IA 50011, USA
    • The Ames Laboratory, Iowa State University, Ames, USA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Paul C. Canfield

    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Iowa State University, Ames Lab
    • Ames Laboratory/ Iowa State University
    • Iowa State University
    • Ames Laboratory
    • Iowa State Univ
    • Ames Laboratory and Dept. of Physics, Iowa State University
    • The Ames Laboratory, Ames, IA 50011, USA
    • Ames Lab, Department of Physics, Iowa State University
    • The Ames Laboratory, Iowa State University, Ames, USA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University

  • Robert J. McQueeney

    • Ames Laboratory and Iowa State University
    • Ames Lab. Iowa State Univ., IA
    • Ames Laboratory/ Iowa State University
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University
    • Ames Laboratory, U.S. DOE; Department of Physics and Astronomy, Iowa State University

  • Alan I. Goldman

    • Ames Laboratory and Iowa State University
    • Ames Lab., Iowa State Univ., IA
    • Ames Laboratory/ Iowa State University
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University