Magnetic and dielectric properties of quasi-two-dimensional manganese oxide Sr7Mn4O15

作者：Gao S; Lv Y D; Wang X X; Yang H S; Ruan K Q^*; Li X G

来源：Journal of Magnetism and Magnetic Materials, 2013, 328: 66-71.

DOI：10.1016/j.jmmm.2012.10.007

• Quasi-two-dimensional
• Manganese oxide
• Electron spin resonance
• Dielectric permittivity
• Spin-lattice coupling

Using dc magnetic susceptibility, electron spin resonance (ESR) and dielectric spectroscopy techniques, we investigate the magnetic and dielectric properties of Sr7Mn4O15, which has a layered structure with pairs of face-sharing octahedra Mn2O9. Magnetic susceptibility reveals the Neel temperature T-N similar to 70.5 K, above which Sr7Mn4O15 manifests intense short range order. ESR spectra indicate the existence of a transition at about 370 K, confirming the suggested spin pairing in the Mn2O9 units. In the dielectric spectra, a sudden drop of permittivity is observed at TN, revealing the existence of strong spinlattice coupling in Sr7Mn4O15.

• 出版日期2013-2
• 单位中国科学技术大学