| 高压下MgB_(2)超导的涡旋动力学研究 |
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| 引用本文： | 桑丽娜,李敏娟,张义邴,朱红妹,彭麟,李文献,蔡传兵. 高压下MgB_(2)超导的涡旋动力学研究[J]. 低温物理学报, 2021, 0(4): 220-224 |
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| 作者姓名： | 桑丽娜 李敏娟 张义邴 朱红妹 彭麟 李文献 蔡传兵 |
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| 作者单位： | 上海大学材料科学与工程学院材料研究所, 上海,200072；上海大学理学院物理系, 上海市高温超导重点实验室, 上海,200444;上海电力大学数理学院,上海,200090 |
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| 摘 要： | 我们首次通过磁弛豫的方法系统研究了高压下MgB_(2)样品的磁通钉扎以及涡旋动力学,测量了其在不同温度和磁场下的磁化强度M随时间t的衰变,即M(t).根据集体蠕动理论,明确了高压效应在低磁场时抑制了磁衰变速率,但在高场下大大的加快了磁衰变.高压降低了临界电流密度J;和钉扎能.另外,在MgB_(2)样品里低场下没有观测到弹性蠕变向塑性蠕变的转变.
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| 关 键 词： | 高压 磁通钉扎 涡旋动态 超导 |
Vortex Dynamics in Superconducting MgB2 under Pressure |
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| SANG Lin,LI Minjuan,ZHANG Yibing,ZHU Hongmei,PENG Lin,LI Wenxian,CAI Chuanbing. Vortex Dynamics in Superconducting MgB2 under Pressure[J]. Chinese Journal of Low Temperature Physics, 2021, 0(4): 220-224 |
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| Authors: | SANG Lin LI Minjuan ZHANG Yibing ZHU Hongmei PENG Lin LI Wenxian CAI Chuanbing |
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| Abstract: | We report the first study on the significant effect of in-situ hydrostatic pressure on the magnetic relaxation in MgB2 crystals. M(t) were measured at different fields and temperatures. We find that vortex creep rates are significantly suppressed by pressure at lower field, but enhanced at higher field. In addition, there is no the crossover from the elastic to the plastic creep at low filed. |
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| Keywords: | Pressure, Flux pinning, Vortex Dynamics, Superconductor |
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