Nematic order and Charge order in Ba0.6Sr0.4Ni2As2

ORAL

Abstract

Studies in the Cuprates and the Fe-based superconductors have hinted at a relationship between charge order order and superconductivity. The recent study on Ba1-xSrxNi2As2 shows strong nematic susceptibility for the B1G symmetry with increasing Sr doping corresponding to an enhancement in Tc. Ba0.6Sr0.4Ni2As2 is at the border of lattice driven nematic order and electronically driven nematic order. We report on X-ray and Neutron measurements on Ba0.6Sr0.40Ni2As2 that show the existence of three charge density waves. An incommensurate CDW in the tetragonal phase with q=(0.27,0,0) and two commensurate CDWs in the triclinic phase with q=(0.33,0,0) and (0.5,0,0) are observed. The commensurate CDWs in the triclinic phase exist down to base temperature. We will discuss these results as well as elastoresistance measurements in Ba0.6Sr0.4Ni2As2.

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Presenters

  • Prathum Saraf

    University of Maryland, College Park

Authors

  • Prathum Saraf

    University of Maryland, College Park

  • Chris Eckberg

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

  • 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

  • John Collini

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

  • Stella Sun

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

  • Daniel J Campbell

    University of Maryland, College Park

  • 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

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