Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/10294
Title: Magnetodielectric effects in A-site cation-ordered chromate spinels LiMCr4O8 (M=Ga and In)
Authors: Saha, R
Fauth, F
Avdeev, M
Kayser, P
Kennedy, BJ
Sundaresan, A
Keywords: Antiferromagnetism
Dielectric properties
Magnetism
L-S coupling
Cations
Jahn-Teller effect
Neutron diffraction
Issue Date: 15-Aug-2016
Publisher: American Physical Society
Citation: Saha, R., Fauth, F., Avdeev, M., Kayser, P., Kennedy, B. J., & Sundaresan, A. (2016). Magnetodielectric effects in A-site cation-ordered chromate spinels LiMCr4O8 (M=Ga and In). Physical Review B, 94(6), 064420. doi:10.1103/PhysRevB.94.064420
Abstract: We report the occurrence of a magnetodielectric effect and its correlation with structure and magnetism in the A-site ordered chromate spinel oxides LiMCr4O8 (M=Ga, In). In addition to magnetic and dielectric measurements, temperature dependent synchrotron and neutron diffraction experiments have been carried out for the Ga compound. The results are compared and contrasted with that of a corresponding conventional B-site magnetic chromate spinel oxide, ZnCr2O4. Like ZnCr2O4, the A-site ordered chromate spinels exhibit a magnetodielectric effect at the magnetic ordering temperature (TN∼13–15K), resulting from magnetoelastic coupling through a spin Jahn-Teller effect. While the presence of a broad magnetic anomaly, associated with a short-range magnetic ordering (TSO∼45K) in ZnCr2O4, does not cause any dielectric anomaly, a sharp change in dielectric constant has been observed in LiInCr4O8 at the magnetic anomaly, which is associated with the opening of a spin gap (TSG∼60K). Contrary to the In compound, a broad dielectric anomaly exists at the onset of short-range antiferromagnetic ordering (TSO∼55K) in LiGaCr4O8. The differences in dielectric behavior of these compounds have been discussed in terms of breathing distortion of the Cr4 tetrahedra. ©2016 American Physical Society
URI: https://doi.org/10.1103/PhysRevB.94.064420
https://apo.ansto.gov.au/dspace/handle/10238/10294
ISSN: 2469-9969
Appears in Collections:Journal Articles

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