| Автор | I O Troyanchuk |
| Автор | D D Khalyavin |
| Автор | S V Trukhanov |
| Автор | H Szymczak |
| Дата выпуска | 1999-11-08 |
| dc.description | The magnetization and magnetoresistance of Ln<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> have been studied for a single crystal (Ln = Nd, x = 0.23) and for ceramics (Ln = Nd, Sm; 0 x0.44). It was shown that Nd<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> compositions in the range 0 x0.05 are inhomogeneous antiferromagnets; a mixed antiferro-ferromagnet state appears in the range 0.05<x<0.10; a pure ferromagnetic state develops in the range 0.2 x<0.4 and in the range x0.4 an inhomogeneous ferromagnetic state is realized. Metal-like behaviour below T<sub>C</sub> is found in the concentration 0.3<x0.44. The concentrational transition from inhomogeneous antiferromagnetic state into spin-glass state in Sm<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> was found at x>0.12. Both Nd and Sm sublattices are coupled antiferromagnetically with manganese ions. All the ferromagnetic Nd<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> samples show similar magnetotransport properties despite of a strong difference in the resistivity behaviour. Our results could be understood in terms of Mn-O-Mn superexchange and 3d orbital ordering as well as variation of band structure due to the ionic size effect, Mn<sup>4+</sup> ion appearance and magnetic ordering. It is supposed that the gap between the narrow 3d manganese band and wide 2p oxygen band decreases strongly below T<sub>C</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Magnetic phase diagrams of the manganites Ln<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> (Ln = Nd, Sm) |
| Тип | paper |
| DOI | 10.1088/0953-8984/11/44/309 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 11 |
| Первая страница | 8707 |
| Последняя страница | 8717 |
| Выпуск | 44 |
