Superconducting Enhancement in Nickel-Pnictide Superconductors

ORAL

Abstract

While the relationship between phase criticality and superconductivity is understood in several conventional systems, open questions remain in many families of high Tc superconductors, wherein structure and magnetic order are closely linked. Utilizing superconducting BaNi2As2 we are able to explore the behavior of superconductivity near a structural instability decoupled from magnetic ordering. Here we present the details and results of both Sr and Co substitutional studies in (Ba,Sr)Ni2As2 and Ba(Ni,Co)2As2, respectively, comparing the evolution of structural and superconducting phases in each case. The resulting phase diagrams as well as the possible mechanism for superconducting enhancement in these systems will be discussed.

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Authors

  • Chris Eckberg

    • University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park 20742, USA
    • Univ of Maryland-College Park

  • Daniel Campbell

    • University of Maryland

  • Tyler Drye

    • University of Maryland

  • Hyunsoo Kim

    • University of Maryland

  • Peter Zavalij

    • University of Maryland

  • Phil Piccoli

    • University of Maryland

  • Jeff Lynn

    • NIST Gaithersburg

  • Johnpierre Paglione

    • University of Maryland