Tricritical wings in itinerant ferromagnet LaCrGe3 under pressure

ORAL

Abstract

In ferromagnetic systems, quantum criticality is avoided either by a change of the transition order, becoming of the first order at a tricritical point (TCP), or by the appearance of modulated magnetic phases. In the first case, for pressures above TCP, application of magnetic field reveals the wing structure phase diagram in $T$-$p$-$H$ space. In the case where the transition leads to modulated magnetic phase, no wing structure phase diagram has been reported so far. Recent pressure study on ferromagnetic LaCrGe$_3$ revealed that the paramagnetic-ferromagnetic quantum critical point is avoided by the appearance of a modulated magnetic phase\footnote{Taufour {\it et al.} Phys. Rev. Lett. \textbf{117}, 037207 (2016)}. We will present the constructed $T$-$p$-$H$ phase diagram of LaCrGe$_3$ via electrical resistivity measurement and discuss a new possibility where tricritical wings appear in addition to the modulated magnetic phase.

*This work was carried out at the Iowa State University and supported by the Ames Laboratory, U.S. DOE, under Contract No. DE-AC02- 07CH11358.

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Authors

  • Udhara Kaluarachchi

    • Iowa State Univ Ames Laboratory
    • Iowa State Univ
    • Iowa State University/ Ames LabLaboratory

  • Sergey Bud'ko

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

  • Paul Canfield

    • Iowa State Univ Ames Laboratory
    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA
    • Iowa State Univ
    • $^A$Ames Laboratory US DOE, $^B$Department of Physics and Astronomy, $^C$Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
    • Iowa State University/ Ames LabLaboratory
    • Ames Lab
    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University
    • Ames Laboratory and Dept. of Phys. and Astro., Iowa State University
    • Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa
    • Iowa State Univ and Ames Laboratory
    • Ames Lab and Department of Physics, Iowa State University, Ames, Iowa

  • Valentin Taufour

    • University of California, Davis
    • Ames Laboratory
    • Ames LabLaboratory