Structural, magnetic, magneto-dielectric and electronic structure study of Mn1.5Cr1.5O4
Abstract
Cr substituted Mn3O4 exhibited increased Néel temperature along with structural transition from tetragonally distorted Mn3O4 (x=0.00) to cubic Mn1.5Cr1.5O4 (x=0.50). Mn1.5Cr1.5O4 exhibits a dielectric anomaly around magnetic transition temperature which suggests that magneto-dielectric coupling is still present in this cubic system. Low-temperature X-ray diffraction pattern of Mn1.5Cr1.5O4 at 20 K has confirmed the absence of structural transition below TN. The observed magneto-dielectric effect in Mn1.5Cr1.5O4 indicates that MD effect has been diminished in comparison to Mn3O4. X-ray photoemission spectra and X-ray absorption near-edge structure (XANES) confirms that Cr exists at the octahedral site with +3 oxidation state. Extended X-ray absorption fine structure (EXAFS) indicates increased short-range ordering in Mn1.5Cr1.5O4 which could be a key factor for this increase in TN.
Authors acknowledge the financial support from the Ministry of Science and Technology, Taiwan through Grants; MOST-107-2112-M-110-012 (H.C.) and MOST-107-2811-M-110-013 (G.D.D.).- Publication:
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APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARG70203D