Evolution of Charge Order in Ba<sub>1-x</sub>Sr<sub>x</sub>Al<sub>4</sub>

ORAL

Abstract

The BaAl4 type structure also hosts a variety of interesting and exotic properties. Recent results have shown an emergence of CDW order in SrAl4 at 243K, together with a hysteretic structural transition at 87K that is thought to be a structural transition to a monoclinic system. The tetragonal structure of BaAl4 has also recently been shown to have topologically non-trivial bands and has lattice parameters very close to SrAl4. In order to study the interplay between these features we have done a chemical substitution study to track the reported transitions. We have performed electrical resistivity measurements, along with x-ray and neutron scattering on the Ba1-xSrxAl4 family. We show a suppression of the CDW order with increased Ba substitution. Neutron scattering and x-ray measurements show the nature of the CDW.

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Presenters

  • Prathum Saraf

    • University of Maryland, College Park

Authors

  • Prathum Saraf

    • University of Maryland, College Park

  • Eleanor M Clements

    • NIST Center for Neutron Research

  • Danila Sokratov

    • University of Maryland, College Park

  • Christopher Eckberg

    • US Army Research Lab Adelphi
    • University of Maryland, College Park

  • Daniel J Campbell

    • University of Maryland, College Park

  • Tom W Heitmann

    • University of Missouri
    • The Missouri Research Reactor and Department of Physics and Astronomy, University of Missouri, USA
    • University of Missouri Research Reactor, University of Missouri, Columbia MO USA

  • Jeffrey W Lynn

    • National Institute of Standards and Tech
    • National Institute of Standards and Technology

  • Peter Y Zavalij

    • Department of Chemistry, University of Maryland, College Park

  • Johnpierre Paglione

    • University of Maryland, College Park
    • Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA
    • Univ of Maryland-College Park