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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.

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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