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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). We have conducted NMR measurements on select rare-earth titanates. Our results point to unusual local behavior well above magnetic ordering temperatures, which is not seen by macroscopic probes. Additionally, we have modified the structural distortions by uniaxial pressure and investigated their effect via magnetic susceptibility measurements.

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Presenters

  • Ana Najev

    Faculty of Science, Department of Physics, University of Zagreb

Authors

  • Ana Najev

    Faculty of Science, Department of Physics, University of Zagreb

  • Damjan Pelc

    School of Physics and Astronomy, University of Minnesota, University of Minnesota, School of Physics and Astronomy, University of Minnesota Twin Cities

  • Sajna Hameed

    School of Physics and Astronomy, University of Minnesota, School of Physics and Astronomy, University of Minnesota Twin Cities

  • Joseph Joe

    School of Physics and Astronomy, University of Minnesota

  • Martin Greven

    School of Physics and Astronomy, University of Minnesota, University of Minnesota, Physics and Astronomy, University of Minnesota, School of Physics and Astronomy, University of Minnesota Twin Cities

  • Miroslav Pozek

    Faculty of Science, Department of Physics, University of Zagreb