| Автор | P Chowdhury |
| Автор | Heon-Jung Kim |
| Автор | S K Gupta |
| Автор | Sung-Ik Lee |
| Дата выпуска | 2004-09-22 |
| dc.description | The isothermal magnetization hysteresis loops were measured for Tl<sub>2</sub>Ba<sub>2</sub>CuO<sub>6</sub> (Tl-2201) single crystals by using a SQUID magnetometer and a micro Hall sensor. In the temperature window from 15 to 30 K, the Hall sensor measurements for M(B) showed a second magnetization peak (SMP) at a peak field, B<sub>sp</sub>, and an onset field, B<sub>on</sub>. In this temperature region, the second peak appeared as a shoulder in the M(H) plots when measured by using SQUID. At a temperature of 20 K, time relaxation measurements for the time interval of 1–10<sup>4</sup> s were carried out at different fields by using a Hall sensor. From these relaxation data, for both flux exit and entry, the activation barrier, U<sub>0</sub>, and the creep exponent, μ, were separately calculated as a function of local field, B<sub>z</sub>, by using the weak collective pinning theory. The variation of μ, and U<sub>0</sub> as a function B indicates that below the onset of the second peak field, B<sub>on</sub>, the creep mechanism is an elastic process, but above it, a gradual transition to plastic creep takes place. At higher fields, μ and U<sub>0</sub> reduce sharply. This has been interpreted as a smooth transition to a 2D collective pinning state. These results are compared with that obtained in a double layer Tl compound, Tl<sub>2</sub>Ba<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub> (Tl-2212),as well as other high-T<sub>c</sub> materials. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | IOP Publishing Ltd |
| Название | Field dependent creep characteristics in Tl<sub>2</sub>Ba<sub>2</sub>CuO<sub>6</sub> single crystals |
| Тип | paper |
| DOI | 10.1088/0953-8984/16/37/008 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 16 |
| Первая страница | 6727 |
| Последняя страница | 6736 |
| Аффилиация | P Chowdhury; National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
| Аффилиация | Heon-Jung Kim; National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
| Аффилиация | S K Gupta; National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
| Аффилиация | Sung-Ik Lee; National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
| Выпуск | 37 |
