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.

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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