Search for a magnetic quantum critical point in LuFe<sub>2</sub>Ge<sub>2</sub> substitution series

ORAL

Abstract

As part of an extensive study of the RFe2Ge2 series [1] a SDW-like transition was discovered in LuFe2Ge2 near 9 K. Given that LuFe2Ge2 has the same structure as the AFe2As2 (A =Alkali and Alkali-Earth) Fe-based superconductors, the possibility of LuFe2Ge2 manifesting fragile magentism [2], and even exotic, emergent states that could be revealed as T-SDW is suppressed toward zero, was enticing. To address this, a study of Y, Sc, Co and Ru substitutions into LuFe2Ge2 was made [3]. Although phase diagrams constructed down to 2-3 K failed to reveal emergent effects [3], in this talk we will present magnetization and specific heat data down to 400 mK and 100 mK respectively. Updated phase diagrams will be presented and discussed.

[1] M.A. Avila et al., JMMM 270 (2004) 51.
[2] P.C. Canfield and S.L. Bud'ko, Annual Rev. of CMP 1 (2010) 27.
[3] S. Ran et al., Phil. Mag. 91 (2011) 4388.

*Work at Ames Laboratory was supported by the U.S. DOE, BES, DMSE. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358. RAR was funded by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4411

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Presenters

  • Raquel Ribeiro

    • Universidade Federal do ABC (Brazil), Iowa State University (USA)
    • Universidade Federal do ABC
    • Ames Laboratory & Iowa State University

Authors

  • Raquel Ribeiro

    • Universidade Federal do ABC (Brazil), Iowa State University (USA)
    • Universidade Federal do ABC
    • Ames Laboratory & Iowa State University

  • Sergey Budko

    • Iowa State University
    • Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory, Iowa State University
    • Ames Laboratory/Iowa State University
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
    • Ames Lab & Dept of Physics and Astronomy, Iowa State University
    • Physics, Iowa State University/Ames Laboratory
    • Iowa State University and Ames Laboratory

  • Paul Canfield

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA.
    • Ames Laboratory
    • Iowa State University
    • Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory, Iowa State University
    • Ames Laboratory/Iowa State University
    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa State University, Ames, IA, USA
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
    • Ames Lab & Dept of Physics and Astronomy, Iowa State University
    • Department of Physics & Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory
    • Physics, Iowa State University/Ames Laboratory
    • Ames Laboratory & Iowa State University
    • Physics, Iowa State University