Effect of pressure on CeGe$_{2-x}$ single crystals

ORAL

Abstract

At ambient pressure CeGe$_{2-x}$ has an antiferromagnetic (AFM) transition at $T_N \sim 7$ K and, on further cooling, a second transition, to a weak ferromagnetic (WFM) state, at $T_C \sim 4$ K. Under pressure the $T_N$ goes through a broad maximum, and then is completely suppressed with a critical point at $\sim 85$ kbar, grossly following the Kondo-necklace picture. The WFM phase evolves into apparent AFM phase under moderate pressure of $\sim 10$ kbar, with $T_N1$ joining $T_N$ at $\sim 60$ kbar. Resulting $P - T$ phase diagram and comparison with CeRu$_2$Ge$_2$ under pressure will be presented.

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Authors

  • Sergey Bud'ko

    • Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA and SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University
    • Department of Physics and Astronomy, Iowa State University and Ames Laboratory

  • D. Braithwaite

    • SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France

  • B. Salce

    • SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France

  • E. Colombier

    • Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA

  • M.S. Torikachvili

    • Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA, and Dept. of Physics, SDSU, San Diego, CA 92182, USA

  • H. Hodovanets

    • Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA

  • P.C. Canfield

    • Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA