Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn1.5Cr1.5O4
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn1.5Cr1.5O4
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| Creator |
Dwivedi, G D
Kumawat, S M Yen, Tsung-Wen Wang, C W Kakarla, D Chandrasekhar Joshi, Amish G Yang, H D Huang, Shin-Ming Chou, H |
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| Subject |
Electronics
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| Description |
Dielectric anomaly observed in cubic Mn1.5Cr1.5O4 around ferrimagnetic ordering temperature (T (N)) suggests a possible magneto-dielectric coupling in the system. This report confirms the presence of a weak but significant magneto-dielectric coupling in the system. The ab initio calculations show a band gap of around 1.2 eV, with Fermi-level closer to the conduction band. The major features of conduction band nearest to the Fermi-level correspond to d ( xz ) and d (3z ) (2) (-r ) (2) orbitals of Mn3+ ion. Temperature-dependent neutron diffraction results show a rapid decay in structural parameters (lattice-striction and transition metal-oxygen bond length) around T (N.) We confirmed that these changes in structural parameters at T (N) are not related to structural transition but the consequences of orbital-ordering of Mn3+. The rapid decay in transition metal-oxygen bond length under internal magnetism of the system shows that magnetism could certainly manipulate the electric dipole moment and hence the dielectric constant of the system. Magneto-striction acts as a link between magnetic and dielectric properties.
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| Publisher |
Institute of Physics
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| Date |
2021-12
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| Type |
Article
PeerReviewed |
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| Identifier |
Dwivedi, G D and Kumawat, S M and Yen, Tsung-Wen and Wang, C W and Kakarla, D Chandrasekhar and Joshi, Amish G and Yang, H D and Huang, Shin-Ming and Chou, H (2021) Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn1.5Cr1.5O4. Journal of Physics-Condensed Matter, 33 (50). Art No-505802. ISSN 0953-8984
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| Relation |
http://cgcri.csircentral.net/5269/
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