| Автор | P. Wagner |
| Автор | I. Gordon |
| Автор | V. V. Moshchalkov |
| Автор | Y. Bruynseraede |
| Автор | M. Apostu |
| Автор | R. Suryanarayanan |
| Автор | A. Revcolevschi |
| Дата выпуска | 2002-04-01 |
| dc.description | We report on the scaling behaviour of the colossal negative magnetoresistance effect (CMR) in a single crystal of the bilayer manganite (La<sub>0.4</sub>Pr<sub>0.6</sub>)<sub>1.2</sub>Sr<sub>1.8</sub>Mn<sub>2</sub>O<sub>7</sub>. The high Pr content is responsible for the absence of long-range ferromagnetism and for a CMR effect in the order of 10<sup>6</sup>. The system is down to the Neél temperature (T<sub>N</sub> = 50 K) in a superparamagnetic state with spin clusters extending over 6–9 unit cells. The coefficient C, which describes the magnetization-induced resistance drop in the paramagnetic state, has absolute values up to C = 15 at 100 K. The temperature dependence C ∝ T<sup>−1</sup> is explained by spin-dependent hopping between magnetic clusters. Spin-dependent scattering and Kondo-lattice models do not account for the magnitude of C and its variation with temperature. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | 2002 EDP Sciences |
| Название | Spin-dependent hopping in the paramagnetic state of the bilayer manganite (La<sub>0.4</sub>Pr<sub>0.6</sub>)<sub>1.2</sub>Sr<sub>1.8</sub>Mn<sub>2</sub>O<sub>7</sub> |
| Тип | lett |
| DOI | 10.1209/epl/i2002-00635-7 |
| Electronic ISSN | 1286-4854 |
| Print ISSN | 0295-5075 |
| Журнал | EPL (Europhysics Letters) |
| Том | 58 |
| Первая страница | 285 |
| Последняя страница | 291 |
| Выпуск | 2 |
