| Автор | C Leroux |
| Автор | M C Cadeville |
| Автор | R Kozubski |
| Дата выпуска | 1989-09-11 |
| dc.description | A comparative study of the dependence on T of the resistivity in non-magnetic Ni<sub>30</sub>Pt<sub>70</sub> and paramagnetic Co<sub>30</sub>Pt<sub>70</sub> alloys in their ordered (L1<sub>2</sub>-type structure) and disordered (A<sub>1</sub>) phase is presented. In order to make measurements of as far as possible real thermodynamic equilibrium states, the heating rates were chosen taking into account previous (Co<sub>30</sub>Pt<sub>70</sub>) or present (Ni<sub>30</sub>Pt<sub>70</sub>) order kinetics data. The authors find that in Ni<sub>30</sub>Pt<sub>70</sub> the resistivity can be analysed in terms of two main contributions: (i) a term of 4 K residual resistivity associated with the chemical disorder, and its variation with T, which is separately measured using a specific device; and (ii) a phonon-like term, proportional to T. In Co<sub>30</sub>Pt<sub>70</sub>, a further term associated with the spin-disorder scattering at present. In the paramagnetic range, this term decreases with T as the chemical disorder increases, the decrease being especially large at the order-disorder (L1<sub>2</sub>-A<sub>1</sub>) transition. Such behaviour is attributed to the existence of short-range magnetic order in the paramagnetic state of Co<sub>30</sub>Pt<sub>70</sub>, which would be enhanced by the increase of the chemical disorder, i.e. by the increase of the Co-Co coordination, thus reducing the spin-disorder contribution to the resistivity. All the data are in very good agreement with a previous comparative study of equi-atomic NiPt and CoPt phases, which led to a similar conclusion. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Competitive contributions of short-range magnetic order and chemical disorder to the resistivity in Co<sub>30</sub>Pt<sub>70</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/1/36/008 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 1 |
| Первая страница | 6403 |
| Последняя страница | 6411 |
| Аффилиация | C Leroux; Inst. de Phys. et Chimie des Mater. de Strasbourg, CNRS, France |
| Аффилиация | M C Cadeville; Inst. de Phys. et Chimie des Mater. de Strasbourg, CNRS, France |
| Аффилиация | R Kozubski; Inst. de Phys. et Chimie des Mater. de Strasbourg, CNRS, France |
| Выпуск | 36 |
