Coexistence of Ferromagnetic and Antiferromagnetic Fluctuations in Iron-germanide Superconductor

ORAL

Abstract

The recently discovered iron-germanide superconductor YFe2Ge2 is of great interest because it is a possible new unconventional iron-based superconductor other than iron pnictides/chalcgenides. In contrast to the parent compounds of most iron-based superconductors, YFe2Ge2 does not exhibit long range magnetic order, but instead shows superconductivity below 1.8K. The nature of its magnetism has not been determined. Here, we report inelastic neutron scattering measurements of single crystalline YFe2Ge2. Both stripe and ferromagnetic spin fluctuations are observed over a wide range of energies. These results suggest that the magnetic ground state is highly frustrated and that both stripe spin fluctuations and ferromagnetic fluctuations are candidates for mediating the electron pairing in YFe2Ge2.

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Presenters

  • Hongliang Wo

    • Fudan Univ

Authors

  • Hongliang Wo

    • Fudan Univ

  • Qisi Wang

    • Fudan Univ

  • Yao Shen

    • Fudan Univ

  • Kenji Nakajima

    • JPARC
    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Seiko Kawamura

    • JPARC
    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Paul Steffens

    • Institut Laue-Langevin
    • Institut Laue Langevin

  • Martin Boehm

    • Institut Laue-Langevin

  • Karin Schmalzl

    • Institut Laue-Langevin
    • Institut Laue Langevin

  • Jitae Park

    • Heinz Maier-Leibnitz Zentrum
    • Forschungs-Neutronenquelle Heinz Maier-Leibnitz

  • Thomas Forrest

    • Diamond Light Source

  • Yang Zhao

    • NIST center for Neutron Research
    • NIST Center for Neutron Research
    • University of Maryland and NIST Center for Neutron Research
    • National Institute of Standards and Technology

  • Jeffrey Lynn

    • NIST Center for Neutron Research
    • NIST center for Neutron Research
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NIST
    • NCNR, NIST -Natl Inst of Stds & Tech

  • Masaaki Matsuda

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Jun Zhao

    • Fudan Univ
    • Fudan University