| Автор | Amish G Joshi |
| Автор | R G Kulkarni |
| Дата выпуска | 2000-08-01 |
| dc.description | The structural and superconducting properties of (Nd<sub>1-y</sub>Ca<sub>y</sub>)Ba<sub>2</sub>(Cu<sub>1-x</sub>Ga<sub>x</sub>)<sub>3</sub>O<sub>z</sub> samples have been studied by x-ray diffraction, resistivity, ac susceptibility and oxygen content measurements. The effect of increasing the Ga concentration in NdBa<sub>2</sub>(Cu<sub>1-x</sub>Ga<sub>x</sub>)<sub>3</sub>O<sub>z</sub> reduces the orthorhombicity without much disturbing the oxygen-vacancy order. This is accompanied by an increase in the normal state resistivity and decreases in both the carrier concentration and T<sub>c</sub>, which is attributed to hole filling by Ga. This suppression of T<sub>c</sub> has been compensated by appropriate hole doping with Ca in (Nd<sub>1-y</sub>Ca<sub>y</sub>)Ba<sub>2</sub>(Cu<sub>1-x</sub>Ga<sub>x</sub>)<sub>3</sub>O<sub>z</sub>, which shows that for a fixed Ga content T<sub>c</sub> increases dramatically as the Ca content increases. For instance, in the oxide (Nd<sub>1-y</sub>Ca<sub>y</sub>)Ba<sub>2</sub>(Cu<sub>0.94</sub>Ga<sub>0.06</sub>)<sub>3</sub>O<sub>z</sub>, the T<sub>c</sub> increases from 0 K (y = 0.0, semiconductor) to 76 K (y = 0.36, compensated oxide) as the hole filling by Ga is nearly balanced by hole doping from Ca. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Effect of Cu-Ga and coupled Nd-Ca/Cu-Ga substitution on the superconductivity of NdBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> |
| Тип | paper |
| DOI | 10.1088/0953-2048/13/8/327 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 13 |
| Первая страница | 1279 |
| Последняя страница | 1285 |
| Аффилиация | Amish G Joshi; Department of Physics, Saurashtra University, Rajkot-360 005, India |
| Аффилиация | R G Kulkarni; Department of Physics, Saurashtra University, Rajkot-360 005, India |
| Выпуск | 8 |
