Influence of structural distortions on the magnetic order of rare-earth titanates

ORAL

Abstract

Perovskite oxides feature fundamentally and technologically alluring properties such as magnetism, superconductivity and colossal magnetoresistance. How structural distortions and disorder influence the electron system in these materials is an important open question. Rare-earth titanates show promise in shedding new light on this problem through the study of their magnetic ground states, which are controlled by distortions induced by different-sized rare-earth ions. The compounds exhibit an interplay among charge, orbital, spin and lattice degrees of freedom, which produces a complex phase diagram that includes ferromagnetic and antiferromagnetic phases (e.g., in Y1-xLaxTiO3) and metal-insulator transitions (e.g., Y1-xCaxTiO3, La1-xSrxTiO3). Using a custom-made uniaxial pressure cell, we have been able to modify the structural distortions and tune the magnetism of rare-earth titanates in a wide range. We compare the results to ab initio calculations and discuss implications for the nature of the ground state and magnetic transitions in these systems.

*This work was funded by the Croatian Science Foundation (Project IP-01-2018-2970) and by the US Department of Energy through the University of Minnesota Center for Quantum Materials under DE-SC-0016371

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Presenters

  • Ana Najev

    • Department of Physics, University of Zagreb, Faculty of Science

Authors

  • Ana Najev

    • Department of Physics, University of Zagreb, Faculty of Science

  • Damjan Pelc

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • University of Zagreb
    • Department of Physics, University of Zagreb, Faculty of Science

  • Sajna Hameed

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • School of Physics & Astronomy, University of Minnesota

  • Dominique Gautreau

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota

  • Joseph Joe

    • School of Physics & Astronomy, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota

  • Zhentao Wang

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • University of Tennessee

  • Miroslav Pozek

    • Department of Physics, University of Zagreb, Faculty of Science

  • Turan Birol

    • University of Minnesota
    • Department of Chemical Engineering and Materials Science, University of Minnesota
    • Physics, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota

  • Rafael Fernandes

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota
    • Physics, University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, 55455 MN
    • School of Physics and Astronomy, University of Minnesota, Minneapolis

  • Martin Greven

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • School of Physics & Astronomy, University of Minnesota