Covalency driven modulation of paramagnetism and development of lone pair ferroelectricity in multiferroic Pb3TeMn3P2O14
| Autor: | Sugata Ray, Mitsuru Itoh, Rafikul Ali Saha, Anita Halder, Tanusri Saha-Dasgupta, Desheng Fu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.180406 |
| Popis: | We have investigated the structural, magnetic, and dielectric properties of the Pb-based langasite compound ${\mathrm{Pb}}_{3}{\mathrm{TeMn}}_{3}{\mathrm{P}}_{2}{\mathrm{O}}_{14}$ both experimentally and theoretically in light of metal-oxygen covalency, and the consequent generation of multiferroicity. It is known that the large covalency between Pb $6p$ and O $2p$ plays an instrumental role behind the stereochemical lone pair activity of Pb. The same happens here, but a subtle structural phase transition above room temperature changes the degree of such lone pair activity and the system becomes ferroelectric below 310 K. Interestingly, this structural change also modulates the charge densities on different constituent atoms and consequently the overall magnetic response of the system while maintaining the global paramagnetism behavior of the compound. This single origin of modulation in polarity and paramagnetism inherently connects both functionalities and the system exhibits mutiferroicity at room temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|