Nonglassy relaxation by double kinks in YBa 2 Cu 3 O 7 − δ with columnar defects
Nonglassy relaxation by double kinks in YBa 2 Cu 3 O 7 − δ with columnar defects
复制标题
具有柱状缺陷的 YBa 2 Cu 3 O 7 − δ 中双扭结的非玻璃态弛豫
DOI：
10.1103/physrevb.61.7135
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发表时间：
2000
影响因子：
3.7
通讯作者：
G. Nieva
中科院分区：
文献类型：
--
作者：
D. Niebieskikwiat;L. Civale;C. Balseiro;G. Nieva
We present long-term relaxation measurements of the irreversible magnetization in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ single crystals with columnar defects. Within the single vortex pinning regime we find a nonglassy response at intermediate currents, in between the half loops and superkinks glassy regimes. We demonstrate that such behavior is due to double kink excitations whose critical nucleus has a size independent of current, and occur even in the presence of pinning energy dispersion.
We present long-term relaxation measurements of the irreversible magnetization in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ single crystals with columnar defects. Within the single vortex pinning regime we find a nonglassy response at intermediate currents, in between the half loops and superkinks glassy regimes. We demonstrate that such behavior is due to double kink excitations whose critical nucleus has a size independent of current, and occur even in the presence of pinning energy dispersion.