| Автор | S M Doyle |
| Автор | M P Sridhar Kumar |
| Автор | D McK Paul |
| Дата выпуска | 1992-03-30 |
| dc.description | The Sr-doped neodymium nickelates have similar (K<sub>2</sub>NiF<sub>4</sub>-type) structures both to the high-T<sub>c</sub> superconductor La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> and to La<sub>2-x</sub>Sr<sub>x</sub>NiO<sub>4</sub> materials, in which anomalous diamagnetic signals have been observed. The authors have made AC-susceptibility, oxygen content, XRD and resistance measurements on Nd<sub>2-x</sub>Sr<sub>x</sub>NiO<sub>4+ delta </sub> samples for a wide range of Sr doping levels (0<or=x<or=1.30). Metal semiconductor transitions occur below room temperature in samples with a high Sr concentration (x>or=0.90) while more subtle changes in the nature of the electrical conductivity occur in the low-temperature resistance of samples with lower doping levels. These changes in resistance with doping and temperature are closely associated with changes in structure and with the strength of the Ni ion magnetic interactions. Similar changes in resistivity occur in the La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> system, although over a much narrower range of Sr doping levels than in the nickelates. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Magnetism and resistivity of Nd<sub>2-x</sub>Sr<sub>x</sub>NiO<sub>4+ delta </sub> compounds |
| Тип | paper |
| DOI | 10.1088/0953-8984/4/13/018 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 4 |
| Первая страница | 3559 |
| Последняя страница | 3568 |
| Аффилиация | S M Doyle; Dept. of Phys. Warwick Univ., Coventry, UK |
| Аффилиация | M P Sridhar Kumar; Dept. of Phys. Warwick Univ., Coventry, UK |
| Аффилиация | D McK Paul; Dept. of Phys. Warwick Univ., Coventry, UK |
| Выпуск | 13 |
