Low-temperature orthorhombic phase stabilization and magneto-dielectric coupling in Mn<sub>2.7</sub>Cr<sub>0.3</sub>O<sub>4</sub>

ORAL

Abstract

Spinel Mn2.7Cr0.3O4 exhibits ferrimagnetic transition and dielectric anomaly simultaneously around 45K. This suggests a correlation between magnetic and dielectric behaviors. A temperature-dependent neutron powder diffraction study revealed a simultaneous structural (tetragonal to orthorhombic phase) and magnetic transition in Mn2.7Cr0.3O4, i.e., the magnetic and structural transitions are linked. These results suggests the spin-lattice coupling controls magneto-dielectric behaviour of Mn2.7Cr0.3O4. The magnetic structure obtained from neutron diffraction study suggests that intrachain octahedral-octahedral exchange interaction is the most prominent interaction which provides canted antiferromagnetic (AFM) spin arrangement to the system. This results is contrary to the general belief that interaction between tetrahedral-octahedral cations are most prominent in the spinel systems.

*Authors acknowledge the Ministry of Science and Technology (MOST)-Taiwan for their financial support through grant no.: MOST-111-2811-M-110-021 (G.D.Dwivedi) and MOST-111-2112-M-110-018 (H.Chou).

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Presenters

  • Gopeshwar Dhar Dwivedi

    • Department of Physics and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C
    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan

Authors

  • Hsiung Chou

    • Department of Physics and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C.
    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan

  • Gopeshwar Dhar Dwivedi

    • Department of Physics and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C
    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan

  • Sagar Mal M Kumawat

    • Department of Physics and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, Taiwan, 80424, R.O.C
    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
    • National Sun Yat-sen University

  • C. W. Wang

    • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R. O. C

  • D. Chandrasekhar Kakarla

    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan

  • H. D. Yang

    • Natl Sun Yat Sen University
    • Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan

  • S. J. Sun

    • Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan, R.O.C.
    • Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan, R. O. C.