Magnetic Structure of Ce(Mn$_{1-x}$Cu$_{x})_{2}$Si$_{2}$

ORAL

Abstract

The magnetic structure of the Ce(Mn$_{1-x}$Cu$_{x})_{2}$Si$_{2}$ (0 $\le $ x $\le $ 1) series, which evolves from a non-magnetic Kondo-heavy-fermion system at $x$=1 to a 3d-antiferromagnetically ordered mixed valence system at $x$=0, has been studied by both temperature and field dependent magnetization ($M)$ measurements using a SQUID magnetometer. Data were taken in both zero-field-cooled (ZFC) and field cooled (FC) processes. It is found that for 0 $\le x <$ 0.4, Neel temperature decreases rapidly with the increase of the Cu concentration $x$. In the range of $x$ from 0.4 $\le $ x $<$ 0.8, ferromagnetic phase is observed below 150 K, and both the ordering temperature $T_{c}$ and Qurie-Weiss $\theta $ decrease with the increase of $x$ . For $x \ge $ 0.8, the $M$ (T) curves are reversible and display paramagnetic behavior. Thus, the system is non-magnetic as it approaches heavy-fermion compound CeCu$_{2}$Si$_{2}$. A magnetic phase diagram is proposed for this compound series.

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Authors

  • Gan Liang

    Sam Houston State University

  • Fei Yen

    University of Houston

  • S. Keith

    Sam Houston State University

  • Nilanjan Das

    Dept. of Physics, ESFM-IPN, Mexico City, Dept. of Physics, The University of Texas at El Paso, Texas A\&M University, Southeast Missouri State University, Departamento de Fisica, FCEN, Universidad de Buenos Aires, Nunez, Argentina, Cyclotron Institute, Texas A\&M University, University of Houston, Denison U., Advanced Space Propulsion Laboratory, AdAstra Rocket Company, Texas Tech University, Department of Chemistry and Biochemistry, Texas State Unv. - San Marcos, Department of Physics, Texas State Unv. - San Marcos, Rice U., Texas State University - San Marcos, Freescale Semiconductor, Inc., Varian Semiconductor Equipment Associates, Gloucester, MA, University of North Texas, Denton, TX, National Insitute of Standards \& Technology, Gaithersburg, MD, James Madison University, Harrisonburg, VA, Texas A\&M University, College Station, TX, Hong Kong University of Science and Technology; Texas Center for Superconductivity and Advanced Materials, University of Houston, Texas Center for Superconductivity at the University of Houston, University of Houston, University of Idaho, Department of Physics, Istanbul Technical University, University of California at Davis, Physics Department, University of South Florida, FL 33620, Physics Department, Texas A\&M University, TX 77843, Center for Studies in Statistical Mechanics and Complex Systems, The University of Texas at Austin, Rice University, TcSUH, University of Houston, Lawrence Berkeley National Laboratory, Hong Kong University of Science and Technology, Institute of Solid State Physics, Bulgarian Academy of Sciences, Hong Kong University of Science and Technology; Texas Center for Superconductivity, University of Houston; Lawrence Berkeley National Laboratory, Texas Center for Superconductivity, University of Houston