Magnetodielectric effects inA-site cation-ordered chromate spinels LiMCr4O8 (M=Ga and In)

Saha, Rana ; Fauth, Francois ; Avdeev, Maxim ; Kayser, Paula ; Kennedy, Brendan J. ; Sundaresan, A. (2016) Magnetodielectric effects inA-site cation-ordered chromate spinels LiMCr4O8 (M=Ga and In) Physical Review B: Condensed Matter and Materials Physics, 94 (6). ISSN 2469-9950

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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 – 15 K), 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 ∼ 45 K) 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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:119996
Deposited On:21 Jun 2021 08:07
Last Modified:21 Sep 2021 10:39

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