Magneto-elastic coupling in multiferroic metal-organic framework [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]Co(HCOO)<sub>3</sub>

ORAL

Abstract

The family of MOFs comprised of methylammonum (A= (CH3)2NH2) and metal (B=Co, Cu, Fe, Mn, Ni) cations with a formate (X=HCOO3) anion has attracted a lot attention recently due to their intriguing multiferroic properties. In the infrared studies under applied magnetic fields, it was concluded that Co complex adopts a different mechanism for facilitating saturation of magnetic states by involving formate stretching distortions unlike other complexes in the family that use the formate bending mode [Inorg. Chem. 57, 11569 (2018).]. Concurrently, we performed Raman spectroscopy on [(CH3)2NH2]Co(HCOO)3 at magnetic fields up to 31T to probe the magneto-elastic coupling. We find that a weak Raman active vibrational mode at about 798 cm-1 corresponding to symmetric bending of the formate ion does exhibit magnetic-field-induced frequency shifts. The results of our investigations and its implications will be discussed in detail in the presentation.

*This work has been performed at the user facilities in the National High Magnetic Field Laboratory (NHMFL), Tallahassee. The NHMFL is supported by the National Science Foundation through NSF/DMR-1644779 and the state of Florida. The project is also funded by DoN HBCU/MI program award # N000141713061.

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Presenters

  • Komalavalli Thirunavukkuarasu

    • Department of Physics, Florida A&M University

Authors

  • Komalavalli Thirunavukkuarasu

    • Department of Physics, Florida A&M University

  • Rachael Richardson

    • Department of Physics, Florida A&M University

  • Zhengguang Lu

    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, Florida

  • Nicholas Combs

    • Department of Materials Science and Engineering, University of Tennessee Knoxville

  • Nan Huang

    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • University of Tennessee

  • Ganesh Pokharel

    • Department of Physics, University of Tennessee Knoxville
    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • University of Tennessee - Knoxville

  • Dmitry Smirnov

    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee, Florida

  • David George Mandrus

    • Materials Science and Technology Division, Oak Ridge National Labratory
    • Materials Science and Engineering, University of Tennessee
    • Department of Materials Science and Engineering, University of Tennessee
    • University of Tennessee
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
    • Oakridge National Laboratory
    • Materials Science and Engineering, University of Tennessee, Knoxville
    • Oak Ridge National Laboratory
    • University of Tennessee - Knoxville
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Department of Physics, University of Tennessee Knoxville
    • Materials Science and Technology, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Materials Science and Technology Division
    • Department of Materials Science, The University of Tennessee
    • University of Tennessee, Knoxville