Two-band magnetoresistance in spin-filter CrVTiAl

ORAL

Abstract

Thin films of spin-filter material CrVTiAl were grown via sputtering, and their magnetotransport properties have been studied up to B=35 T. The resistivity vs T shows 2-channel semiconducting behavior with a disordered gapless channel and an activated gapped channel. Magnetoresistance measurements provide values for the mobilities of the two conducting channels, 900 and 50 cm2/Vs. This leads to a ratio of 18:1 for the effective masses, which corresponds to that predicted by density functional theory. Hall and magnetization measurements reveal a small moment saturating near 15 T that is assigned to partial non-compensation of the sublattices. These results combined with previous studies [1,2] show CrVTiAl to be a compensated ferrimagnet with a spin-polarized electronic structure.
[1] I. Galanakis, K. Ozdogan, and E. Sasioglu, J. Phys. Condens. Matter 26, 86003 (2014).
[2] G.M. Stephen, I. McDonald, B. Lejeune, L.H. Lewis, and D. Heiman, App. Phys. Lett. 109, 24 (2016).

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Presenters

  • Gregory Stephen

    Department of Physics, Northeastern University, Northeastern University

Authors

  • Gregory Stephen

    Department of Physics, Northeastern University, Northeastern University

  • Christopher Lane

    Northeastern, Northeastern University

  • Ioana G Buda

    Northeastern University

  • David E Graf

    National High Magnetic Field Laboratory, National High Magnetic Field Lab, Tallahassee, FL, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, NHMFL, Tallahassee, FL, United States, Florida State University, National High Magnetic Field Laboratory, Florida State University, NHMFL-FSU, National High Magnetic Field Laboratory and Florida State University, NHMFL

  • Stanislaw Kaprzyk

    AGH University of Science and Technology

  • Bernardo Barbiellini

    Physics, Lappeenranta University of Technology, Lappeenranta University of Technology, Department of Physics, School of Engineering Science, Lappeenranta University of Technology, Physics, School of Engineering Science, Lappeenranta University of Technology, Lappeenranta, Finland

  • Arun Bansil

    Northeastern University, Department of Physics, Northeastern University

  • Donald E Heiman

    Northeastern University