3D-ΔPDF analysis of three-dimensional CDW compound (Ca<sub>x</sub>Sr<sub>1-x</sub>)<sub>3</sub>Rh<sub>4</sub>Sn<sub>13</sub>

ORAL

Abstract

A three-dimensional compound series (CaxSr1-x)3Rh4Sn13 has been identified as a promising system to understand the interplay between charge-density-waves (CDW) and superconductivity. The second order CDW transition temperature T* in this family can be fully suppressed with the substitution of Ca for Sr, giving rise to a Quantum Critical Point at x≈0.9 at ambient pressure. For a comprehensive understanding of the lattice instability connected to this CDW transition and superconductivity, diffuse scattering measurements were performed on single crystals of (CaxSr1-x)3Rh4Sn13 with (x=0, 0.1, 0.5, 0.6, 0.65, 0.7, 0.9) using x-ray diffraction. A 3D-ΔPDF analysis shows that there is an order-disorder transition at T*, with local distortions still present at higher temperature.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Puspa Upreti

    • Physics (NIU) and Material Science Division (ANL), Northern Illinois University

Authors

  • Puspa Upreti

    • Physics (NIU) and Material Science Division (ANL), Northern Illinois University

  • Matthew Krogstad

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory
    • Materials Science Division, Argonne National Lab
    • Material Science, Argonne National Laboratory
    • Material Science Division, Argonne National Laboratory

  • Lekh Poudel

    • Physics, National Institute of Standards and Technology

  • Stephan Rosenkranz

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory
    • Materials Science Division, Argonne National Lab
    • Materials Science, Argonne National Laboratory
    • Material Science, Argonne National Laboratory
    • Material Science Division, Argonne National Laboratory

  • Raymond Osborn

    • Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory
    • Materials Science Division, Argonne National Lab
    • Materials Science, Argonne National Laboratory
    • Material Science, Argonne National Laboratory
    • Material Science Division, Argonne National Laboratory

  • Omar Chmaissem

    • Physics, Northern Illinois University
    • Physics, Northern Illinois University, Material Science Division, Argonne National Lab
    • Northern Illinois University
    • Physics (NIU) and Material Science Division (ANL), Northern Illinois University