Nematicity and Superconducting Enhancement in Ba<sub>1-x</sub>Sr<sub>x</sub>Ni<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

The nematic phase, wherein electronic degrees of freedom drive a reduction in crystal rotational symmetry, is a common motif across a number of high temperature superconductor systems. In an effort to expand on the limited number of known nematic systems we report the evolution of a number of physical properties, including elastoresistance, in the Ba1-xSrxNi2As2 series, which shows a crossover between structural and electronically driven nematicity in the absence of long range magnetic order and unconventional superconducting pairing. In addition to establishing BaNi2As2 as a new and unique nematic system, we also observe dramatically enhanced superconducting Tc near the zero temperature nematic phase boundary in this series, pointing towards enhanced pairing due to strengthened nematic fluctuations.

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Presenters

  • Chris Eckberg

    • University of Maryland, College Park

Authors

  • Chris Eckberg

    • University of Maryland, College Park

  • Daniel Campbell

    • University of Maryland, College Park

  • John C Collini

    • University of Maryland, College Park

  • Tristin E Metz

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

  • Halyna Hodovanets

    • University of Maryland, College Park

  • Peter Zavalij

    • University of Maryland, College Park

  • Sangjun Lee

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

  • Peter Abbamonte

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

  • Morten Holm Christensen

    • University of Minnesota

  • Rafael M Fernandes

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
    • School of Physics and Astronomy, University of Minnesota
    • Physics, University of Minnesota

  • Jeffrey W Lynn

    • National Institute of Standards and Technology
    • NIST
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • NIST Center for neutron research, National Institute of Standard and Technology, Gaithersburg, MD

  • Johnpierre Paglione

    • Physics, University of Maryland
    • University of Maryland, College Park
    • Center for Nanophysics and Advanced Materials, University of Maryland College Park
    • Center for Nanophysics and Advance Materials, University of Maryland, College Park, MD
    • University of Maryland, College Park & NIST
    • Department of Physics, University of Maryland, College Park
    • University of Maryland
    • University of Maryland - College Park