由熔融织构YBCO块材表面剩余磁感应强度的磁光图像,推算出局域有效激活能U和电流密度j,进而研究磁通运动的局域效应.在样品的边缘区域,U(j)符合Zeldov对数模型,在样品中心区域,U(j)应该符合Anderson-Kim线性模型.在涡旋线向样品中心运动的前沿区域,可以观察到电流密度随时间先升后降.
参考文献
[1] | M V Feigel'man;V B Geshkenbein;A I Larkin;V M Vinokur .Theory of collective flux creep[J].Physical Review Letters,1989,63:2303. |
[2] | E Zeldov;N M Amer;G Koren;A Gupta,R J Gambino,M W McElfresh .Flux creep characteristics in High-temperature Superconductors[J].Physical Review Letters,1989,62:3093. |
[3] | M P Maley;J O Willis;H Lessure;M E McHenry .Dependence of Flux-Creep Activation Energy Upon Current Density in Grain-aligned YBa1Cu3O7-x[J].Physical Review,1990,B42:2639. |
[4] | Y Abulafia;A shaulov;Y Wolfus;R Prozorov,L Burlachkov,Y Yeshurun,D Majer,E Zeldov,V M Vinokur .Local Magnetic Relaxation in High-temperature Superconductors[J].Physical Review Letters,1995,75:2404. |
[5] | Z X Gao;X Yang;S G Wang;L Xiao,H T Ren,Y L Jiao,Y D Dai Z Z Gan .Direct observationof remnant fields in Y2BaCuO5[J].Phycica C,1997,282-287:2087. |
[6] | M Golosovsky;M Tsindlekht;H Chayet;D Davidov .Vortex depinning frequency in Yba2Cu3O7-x Superconducting thin films:Anistropy and temperature dependence[J].Physical Review,1994,B50:470. |
[7] | M V Feigel'man;V B Geshkenbein;V M Vinokur .Flux creep and current relaxation in high-Tc superconductors[J].Physical Review,1991,B43:6263. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%