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Hybrid Molecular Beam Epitaxy of DyTiO<sub>3</sub> Films

ORAL

Abstract

Rare-earth titanates RTiO3 (R = La… Lu or Y) are prototypical Mott-Hubbard insulators and are of great interest for studying the correlations among electronic, magnetic, and orbital orders. Among them, DyTiO3 (DTO) has the highest Curie temperature (Tc) of 60 K, as well as typically high coercive field and remanent magnetization. Nevertheless, due to its highly distorted structure, the growth of high-quality DTO films remains challenging. In this study, we demonstrate the first hybrid molecular beam epitaxy growth of DTO films on LaAlO3(001) and DyScO3(110) substrates. Films grown at optimized stoichiometric conditions show clear ferromagnetism with bulk-like Tc = 60 K. Spectroscopic analysis confirms these DTO films as nominally stoichiometric. By systematically tuning the Dy flux, we find that small deviations in cation stoichiometry lead to simultaneous disappearance of film peaks in X-ray diffraction and ferromagnetism. Based on these results, we discuss the correlation between stoichiometry, crystal structure, and ferromagnetic order in DTO films, providing critical insight into the structure-property relationship in DTO and other rare-earth titanates.

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Presenters

  • Dooyong Lee

    Department of Chemical Engineering and Materials Science, University of Minnesota

Authors

  • Dooyong Lee

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Jin Yue

    Department of Chemical Engineering and Materials Science, University of Minnesota, University of Minnesota

  • Malleswararao Tangi

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Hwanhui Yun

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Supriya Ghosh

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Sajna Hameed

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

  • Joseph Joe

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

  • John Freeland

    argonne national laboratory, Argonne National Laboratory, Advanced Photon Source, Argonne National Laboratory, Argonne National Laboratory, Advanced Photon Source, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • Chris Leighton

    University of Minnesota, Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota

  • Martin Greven

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

  • K. A. Mkhoyan

    Chemical engineering and materials science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota

  • Bharat Jalan

    University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Department of Electrical and Computer Engineering, University of Minnesota