摘要
Magnetic hysteresis M(H) and magnetic relaxation M(t) results on Pr-doped single-crystal Bi2Sr2Ca0.89Pr0.11Cu2O8+δ with optimum Tc = 88 K are reported. Superconducting H-T phase diagram with applied field parallel to single-crystal c-axis indicates that in the mixed state the anomalous second peak field and its onset field H2p/Hon varies from 900/800 G at 15 K to 210/85 G at 40 K with a plateau around 20-30 K. Low-field magnetic relaxation M(t) data near H2p/Hon indicates a distinct change of flux creep behavior. For H<Hon, the relaxation mechanism follows the collective creep model M(t) = M0[1+(μkBT/U0)ln(t/t0)]-1/μ and crosses to the vortex glass model M(t) = M0(t/t0)1/[1-(U(0)/k(B)T)] when H>Hon. Such a crossover behavior implies a change in vortex coupling mechanism from vortex quasi-lattice to entangled vortex glass.
原文 | 英語 |
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頁(從 - 到) | 931-932 |
頁數 | 2 |
期刊 | Physica B: Condensed Matter |
卷 | 281-282 |
DOIs | |
出版狀態 | 已發佈 - 2000 6月 1 |
對外發佈 | 是 |
事件 | Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn 持續時間: 1999 8月 24 → 1999 8月 28 |
ASJC Scopus subject areas
- 電子、光磁材料
- 凝聚態物理學
- 電氣與電子工程