Magnetic Phase Diagram of CeMnCuSi$_{2}$

ORAL

Abstract

Field and temperature dependent magnetization measurements on polycrystalline CeMnCuSi$_{2}$ reveal the Mn moments in this compound exhibit ordering with a ferromagnetic (FM) component ordered instead of the previously reported purely antiferromagnetic (AFM) ordering. The FM ordering temperature, $T_{c}$, is about 120 K and almost unchanged with external fields up to 50 kOe. Furthermore, an AFM component is observed to be present in this phase, and its orientation is modified rapidly by the external magnetic field. The Ce $L_{3}$-edge x-ray absorption result shows that the Ce ions in this compound are nearly trivalent. Large thermomagnetic irreversibility is observed between the zero-field-cooled (ZFC) and field-cooled (FC) $M(T)$ curves below $T_{c}$ indicating strong magnetocrystalline anisotropy in the ordered phase. At 5 K, a metamagnetic type transition is observed to occur at a critical field of about 8 kOe, and this critical field decreases with increasing temperature. Based on these results, a magnetic phase diagram is constructed for CeMnCuSi$_{2}$.

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Authors

  • Gan Liang

    Sam Houston State University

  • F. Yen

    University of Houston

  • Dana Dunn

    University of Texas at Arlington, Peoples Friendship University of the Russia, TSAAPT Officer, University of Texas at El Paso, Department of Chemistry, Stephen F. Austin University, Department of Physics, Stephen F. Austin University, Highland Park High School, Dallas, Texas, Lamar High School, Arlington, Texas, Angelo State University, Abilene Christian University, Southern Nazarene University, Texas Tech University, Sam Houston State University, University of Texas at Austin, Cornell University, University of Houston, University of Texas Center for Relativity, Ion Beam Modification and Analysis Laboratory (IBMAL), University of North Texas, University of North Texas, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, NanoTech Institute, University of Texas at Dallas, Richardson, TX 75083, Department of Physics, The University of Texas at Arlington, Arlington, Texas 76019, Department of Physics, University of Texas at Arlington, Arlington, TX, 76019, UTA High Energy Physics Group, Univ. of Texas, Arlington, USA, KAERI Korea, Changwon National Univ., Korea, Rutgers University, Iowa State University, Rigaku/MSC, Texas Christian University, Dept. of Physics, Changwon National University, Department of Physics, University of North Texas, Department of Chemistry and Biochemistry, Arizona State University, Research Center, Philip Morris USA, Harrington Department Bioengineering Arizona State University, Universidad Autonoma de Colima, Universidad de Buenos Aires, Department of Physics, University of Texas, Arlington, Chair, Department of Physics, University of Texas at Arlington, Dean of Science, University of Texas at Arlington, President, University of Texas at Arlington, Department of Electrical Engineering, Princeton University, Department of Physics, Texas A\&M University, NanoFAB Center and Electrical Engineering Department, University of Texas at Arlington, University of Texas at San Antonio, SEMATECH, University of Texas at Dallas, CINVESTAV Queretaro, Mexico and University of Texas at Dallas, Texas A\&M University, Departamento de F\'isica, FCEN, Universidad de Buenos Aires, Freescale Semiconductor, Inc., Department of Physics, UT Austin, Physics Department, The University of Texas at Arlington, Department of Physics, University of Texas at Arlington, Tolar High School, Granbury High School