Colossal linear magnetoresistance in LaTiO<sub>3</sub>thin films on SrTiO<sub>3</sub>

ORAL

Abstract

LaTiO3, a 3d transition metal oxide, has been of interest for its prototypical Mott insulator character, and can be readily tuned by excess oxygen doping from the insulating to the metallic phase. In this study, metallic thin films of LaTiO3 of different thicknesses (3, 5 and 10u.c.) grown by pulsed laser deposition on SrTiO3 substrates are investigated and show a series of very interesting transport effects. The films show metallic behavior, high carrier densities of ~ 2x1023 cm-3 and transport mobilities of μ > 40 000cm2 /V.s at low T. Under a perpendicular magnetic field, a strong non-saturating colossal magnetoresistance (CMR) develops with amplitudes up to 6500%. Moreover, this MR is observed to be linear starting from very low field (<1T) and non-saturating up to at least 11T. This very distinct feature is compatible with the existence of low-mobility islands with a coverage of up to 88%. The presence of so many islands under magnetic field in an otherwise high mobility system at zero magnetic field, hints to a possible paramagnetic nature of the islands. On top of these findings, an in-plane anisotropic magnetoresistance (AMR) and a planar Hall effect (PHE) is observed.

*This work was funded by the German Würzburg-Dresden Cluster of Excellence ct.qmat (EXC2147).

–

Publication: Colossal linear magnetoresistance in LaTiO3 thin films on SrTiO3 (in preparation)

Presenters

  • Teresa M Tschirner

    • IFW Dresden
    • Institut für Festkörperphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden

Authors

  • Teresa M Tschirner

    • IFW Dresden
    • Institut für Festkörperphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden

  • Berengar Leikert

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Marc Gabay

    • Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay

  • Kirill Miller

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Fabian Hartmann

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Sven Hoefling

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Joseph Dufouleur

    • Institut für Festkörperphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden

  • Michael Sing

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Bernd Büchner

    • IFW Dresden
    • Institut für Festkörperphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden

  • Ralf Claessen

    • Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

  • Louis Veyrat

    • Institut für Festkörperphysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden