Emergence of Competing Stripe Phase near the Mott Transition in Ti-doped Bilayer Calcium Ruthenates

ORAL

Abstract

The physics of nanoscale phase separation is at the heart of strongly correlated materials, where multiple degrees of freedom such as charge, spin, lattice, and orbital are simultaneously active. Using microwave impedance microscopy, we spatially resolved the coexisting phases on a Ca3(Ru0.9Ti0.1)2O7 bulk crystal during the metal-insulator transition. Different from a typical first- order phase transition where coexistence of the two terminal phases takes place, a new stripe phase oriented along the in-plane crystalline axes emerges inside both the G-type antiferromagnetic insulating state and paramagnetic metallic state. The effect of this electronic state can be observed in macroscopic measurements, allowing us to construct a phase diagram that takes into account the energetically competing phases. Our work provides a model approach to correlate macroscopic properties and mesoscopic phase separation in complex oxides. Furthermore, we investigate Ca3(Ru0.92Mn0.08)2O7 crystal to study the effect of magnetic dopants on the Metal-Insulator phase transition.

*U.S (DOE), award no. DE-SC0019025 and NSF (2DCC-MIP) award no. DMR-1539916

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Presenters

  • Ashish Gangshettiwar

    • University of Texas at Austin

Authors

  • Ashish Gangshettiwar

    • University of Texas at Austin

  • Yanglin Zhu

    • The Pennsylvania State University
    • Physics, Penn State University
    • Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, The Pennsylvania State University

  • Jin Peng

    • Tulane University

  • Yu Wang

    • Department of Physics, Penn State University
    • Physics, Penn State University
    • Physics, The Pennsylvania State University

  • Zhanzhi Jiang

    • University of Texas at Austin

  • Jiaming He

    • University of Texas at Austin
    • Texas Materials Institute, University of Texas at Austin
    • Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin

  • Jianshi Zhou

    • University of Texas at Austin
    • Materials Science and Engineering Program, Department of Mechanical Engineering, University of Texas at Austin
    • University of Texas (Austin, USA)
    • University of Texas
    • Texas Materials Institute, University of Texas at Austin
    • Materials Science and Engineering Program, Mechanical Engineering, University of Texas at Austin

  • Zhiqiang Mao

    • Pennsylvania State University
    • Department of Physics, Penn State University
    • The Pennsylvania State University
    • Penn State University
    • Physics, Penn State University
    • Department of Physics, Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Materials Science and Engineering, Pennsylvania State University

  • Keji Lai

    • University of Texas at Austin
    • Department of Physics, University of Texas at Austin