Quantum criticality on ferromagnetic systems: it is not where you think it is!

ORAL

Abstract

When a ferromagnetic-paramagnetic transition is tuned to $0$~K by application of pressure in clean systems, the transition becomes of the first order at a tricritical point before disappearing. Instead of having a quantum critical point, i.e. a second order transition at $0$~K, there is a quantum phase transition of the first order. The quantum phase transition can be from a ferromagnetic to a paramagnetic phase, or to a spatially modulated phase. We illustrate this case on a new material: LaCrGe$_3$. We will present the temperature-pressure-magnetic field phase diagram of LaCrGe$_3$ and show that quantum criticality is avoided by the appearance of a modulated phase. We will also explain how quantum criticality can be re-introduced. Work at Ames Laboratory was supported by US DOE under the Contract No. DE-AC02-07CH11358. Magnetization measurements under pressure were supported by Ames Laboratory's laboratory-directed research and development (LDRD) funding.

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Authors

  • Valentin Taufour

    • The Ames Laboratory and Iowa State University
    • Ames Lab., Dept. of Physics and Astronomy, Iowa State Univ.
    • Iowa State University/ Ames Laboratory
    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Udhara Kaluarachchi

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Manh Cuong Nguyen

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Stella K Kim

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Xiao Lin

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Eun Deok Mun

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Hyunsoo Kim

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Yuji Furukawa

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Cai Zhuang Wang

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Kai Ming Ho

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Sergey L Bud'ko

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Paul C Canfield

    • Ames Laboratory / Iowa State University, Ames, IA 50011, USA

  • Zurab Guguchia

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

  • Rustem Khasanov

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

  • Pietro Bonfa

    • Dipartimento di Fisica e Scienze della Terra, Parco Area delle Scienze 7/A, I-43124 Parma, Italy

  • Roberto De Renzi

    • Dipartimento di Fisica e Scienze della Terra, Parco Area delle Scienze 7/A, I-43124 Parma, Italy