Incommensurate magnetism near quantum criticality in CeNiAsO

ORAL

Abstract

CeNiAsO is isotructural to the 1111 Fe-based superconductors but exhibits Rare-earth based heavy fermion magnetism. Two phase transitions in the tetragonal strongly correlated electron system CeNiAsO were probed by neutron scattering and zero field muon spin rotation ( μSR) [1]. For T < TN1 = 8.7(3) K, a second order phase transition yields an incommensurate spin density wave with wave vector k = (0.44(4), 0, 0). For T < TN2 = 7.6(3) K, we find co-planar commensurate order with a moment of 0.37(5) μB. By substitution of P for As or by applying pressure, the material can be driven into a paramagnetic Fermi-liquid phase [2]. Non-Fermi-liquid transport is found up to the critical phosphorus concentration xc = 0.4(1). We employed μSR to study several compositions across the phase diagram. CeNiAs1−xPxO shows the commensurate order only exists for x ≤ 0.1 so the transition at xc = 0.4(1) is from an incommensurate longitudinal spin density wave to a paramagnetic Fermi liquid. Within the conventional Hertz-Millis framework this suggests the volume of the Fermi-surface is sustained through the Quantum critical point and yet the anomalous transport properties are incompatible with this framework.
[1] Shan Wu, et al. arXiv:1707.09645 (2017)
[2] Luo, Y. et al. Nature Material 13,777-781(2014)

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Presenters

  • Shan Wu

    Univ of California - Berkeley

Authors

  • Shan Wu

    Univ of California - Berkeley

  • Adam Phelan

    Johns Hopkins University, Louisiana State Univ - Baton Rouge

  • Jennifer Morey

    Johns Hopkins University

  • Joerg Neuefeind

    Oak Ridge National Lab, Chemical and Engineering Materials Division, Oak Ridge National Laboratory

  • Matthew Stone

    Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laborator, Neutron scattering devision, Oak Ridge National Lab

  • Ashfia Huq

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Benjamin Frandsen

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Physics, University of California, Berkeley, Univ of California - Berkeley, Department of Physics, University of California, Berkeley

  • David Tam

    Rice University, Physics, Rice University

  • Sarah Dunsiger

    Simon Fraser University, Physics, Simon Fraser University, Department of Physics, Simon Fraser University

  • Benjamin Trump

    NIST Center for Neutron Research, Johns Hopkins University

  • Cheng Wan

    Johns Hopkins University

  • Tyrel McQueen

    Johns Hopkins University, Institute for Quantum Matter, Johns Hopkins University, Department of Chemistry , Johns Hopkins University, The Johns Hopkins University

  • Yasutomo Uemura

    Columbia Univ, Department of Physics, Columbia University, Columbia University, Department of Physics, Columbia university

  • Collin Broholm

    Johns Hopkins University, Institute for Quantum Matter, Johns Hopkins University