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Avoided ferromagnetic quantum critical point in pressurized La<sub>5</sub>Co<sub>2</sub>Ge<sub>3</sub>

ORAL

Abstract

A quantum phase transition is a phase transition that occurs at 0 K. For many second-order phase transitions, application of a magnetic field, doping or pressure can suppress the transition temperature and lead to a quantum critical point (QCP). However, avoided quantum criticality is often observed in intermetallic, ferromagnetic systems. The mechanism behind this phenomenon has been discussed intensively in recent years. Lately, we discovered a new ferromagnetic compound, La5Co2Ge3, which has a Curie temperature Tc ~ 3.8 K. The physical properties under pressure and the pressure dependence of Tc are studied up to ~ 5 GPa. We find that a ferromagnetic QCP is avoided by the appearance of a new, most likely magnetic, phase. Details of the T-p phase diagram and the possible nature of the new phase will be discussed.

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Presenters

  • Li Xiang

    Ames Laboratory and Iowa State University, Iowa State University, Ames Laboratory, Iowa State University

Authors

  • Li Xiang

    Ames Laboratory and Iowa State University, Iowa State University, Ames Laboratory, Iowa State University

  • Scott Saunders

    Iowa State University

  • Sergey L. Bud'ko

    Iowa State University, Ames Laboratory and Iowa State University, Ames Lab, Ames laboratory, Ames, IA, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Ames Laboratory, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University, Ames Laboratory, Division of Materials Sciences & Engineering, Ames Lab and Iowa State University, Iowa State University/Ames Laboratory

  • Paul C Canfield

    Iowa State University, Ames Laboratory and Iowa State University, Ames Lab, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames laboratory, Ames, IA, Ames Laboratory, Iowa State University, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University, Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Division of Materials Sciences & Engineering, Ames Lab and Iowa State University, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy, Iowa State University/Ames Laboratory