Charge Order in Tunable Electronic Nematic Superconductor Ba1-xSrxNi2As2

ORAL

Abstract

Recent discoveries of charge order in the cuprates and electron nematic order in the iron-based superconductors has pointed towards the possibilities of both orderings being tied to mechanisms of high Tc superconductivity.The Ba(1-x)Sr(x)Ni2As2 system, closely related to the BaFe2As2 system, has recently been shown to exhibit both types of ordering without the presence of any magnetic order. We report single crystal X-ray diffraction observations that show a unidirectional charge order with wavevector (0.27,0,0) in BaNi2As2 decays and vanishes by x=0.65. We also show that the (0.33,0,0) CDW in the triclinic phase evolves into a (0.5,0,0) CDW by x=0.65. The evolution of the charge order in this system correlates well with the reported evolution of nematicity and superconducivity, suggesting a strong link between the three phases.

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Presenters

  • John Collini

    • University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park

Authors

  • John Collini

    • University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park

  • Sangjun Lee

    • University of Illinois,Urbana Champaign
    • Department of Physics, Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
    • University of Illinois Urbana Champaign
    • University of Illinois at Urbana-Champaign

  • Stella Sun

    • University of Illinois,Urbana Champaign
    • Department of Physics, Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign

  • Chris Eckberg

    • University of Maryland, College Park
    • Physics Department, University of Maryland

  • Jeffrey Lynn

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • NIST
    • Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NIST Center for Neutron Research

  • Peter Abbamonte

    • University of Illinois at Urbana-Champaign
    • University of Illinois,Urbana Champaign

  • Johnpierre Paglione

    • University of Maryland, College Park
    • Physics Department, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park
    • Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park & NIST
    • Univ of Maryland-Colege Park
    • Center for Quantum Materials, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742