Magneto-Raman Spectroscopy on Vanadium-derived Lacunar Spinel GaV<sub>4</sub>S<sub>8</sub>

POSTER

Abstract

Chalcogenides with the GaM4S8 structure are hetero- cubane like [M4X4]n+ cubes (M = Mo, Re,V, Nb, Ta; X = S, Se, Te) and [AX4]n- tetrahedra (A= Ga, Ge), these adopt the NaCl structure[1,2]. GaV4S8 is a known Mott insulator because of the long inter-cluster distances approximately 4 Å apart [1]. GaV4S8 (GaVS) is a magnetic semiconductor with a Neel-type skyrmion phase displaying multiferroic properties [3]. Magnetic susceptibility measurements showed structural transition at TJT of 42 K followed by a ferromagnetic order at 12 K [4] and 12.7 K [5]. Temperature-dependent infrared and Raman measurements identified phonon modes and Jahn-Teller distortions [6]. For detailed information on the various exchange interactions in GaV4S8, we performed magneto-Raman measurements at magnetic fields up to 20 T and temperatures down to 5 K.

References:
[1] R. Pocha et. al. Chem. Mater., 12, 2882 (2000)
[2] V. Malik et. al. EPL, 101, 67008 (2013)
[3] I. Kézsmárki et. al. Nat. Matter. 14, 1116 (2015)
[4] C.S. Yadav et al. Phys. Rev. B: Condens. Matter. 403, 1474 (2008)
[5] S. Reschke et. al. PHY. REV. B 96, 144302 (2017)
[6] J. Hlinka et al. Phys. Rev. B. 94, 060104 (2016)

*Work at NHMFL was supported by NSF DMR-1644779 and the state of Florida. The project is also funded by DoN HBCU/MI program.

Presenters

  • Calvert Barclay

    • Physics, Florida A&M University

Authors

  • Calvert Barclay

    • Physics, Florida A&M University

  • D. Ologunaguba

    • Physics, Florida A&M University

  • Zhengguang Lu

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Lab
    • Condensed Matter Science, National High Magnetic Field Laboratory

  • Ganesh Pokharel

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Materials Science and Engineering, University of Tennessee
    • Department of Physics & Astronomy, The University of Tennessee

  • Hasitha Suriya Arachchige

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Physics and Astronomy, University of Tennessee
    • Materials Science and Engineering, University of Tennessee
    • Department of Physics & Astronomy, The University of Tennessee

  • Andrew D Christianson

    • Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak-Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • David Mandrus

    • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
    • Materials Science and Engineering, University of Tennessee

  • Dmitry Smirnov

    • National High Magnetic Field Laboratory
    • Natl High Magnetic Field Lab
    • National High Magnetic Field Lab
    • Condensed Matter Science, National High Magnetic Field Laboratory

  • Komalavalli Thirunavukkuarasu

    • Florida A&M University
    • Physics, Florida A&M University