Abstract
Magnetic and dielectric properties of the ruthenium double perovskites La 2MRuO 6 (M = Mg, Co, Ni, and Zn) were investigated. The magnetization measurements for M = Co and Ni showed the existence of magnetic order at 20-30 K. Though the oxides with M = Zn and Mg exhibit a deviation from the Curie-Weiss law, magnetic order was not clearly observed. The result of La 2ZnRuO 6 was different from that previously reported, in which a ferromagnetic transition was found at around 165 K. The AC dielectric measurements for M = Co and Ni showed large dielectric constants (typically larger than 1000) at around room temperature, suggesting both the formation of short-ranged polar regions and the magnetic origin of large dielectric constant. In addition, two peaks were found for the temperature dependence of the tan δ component for La 2NiRuO 6. The behavior suggests the existence of two different polar regions.
Original language | English |
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Pages (from-to) | 2812-2817 |
Number of pages | 6 |
Journal | Physica Status Solidi (A) Applications and Materials Science |
Volume | 203 |
Issue number | 11 |
DOIs | |
Publication status | Published - Sep 1 2006 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Electrical and Electronic Engineering
- Materials Chemistry