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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Vortex pinning and anisotropy in Ag/(Bi, Pb)(2)Sr2Ca2Cu3O10 tapes by means of surface columnar defects
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Vortex pinning and anisotropy in Ag/(Bi, Pb)(2)Sr2Ca2Cu3O10 tapes by means of surface columnar defects

机译：表面柱状缺陷在Ag /（Bi，Pb）（2）Sr2Ca2Cu3O10带中的涡旋钉扎和各向异性

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Surface columnar defects (SCDs) are produced in high-quality Ag/(Bi, Pb)(2)Sr2Ca2Cu3O10 tapes by irradiating them with 0.25 GeV gold ions only on a top layer up to about 10% of the full volume. The ion beam is orthogonal to the tape plane. Such defects seem to be able to confine the vortices inside 'tubes' having a diameter determined by the SCD average distance. This confinement shows itself in the shift of irreversibility lines (ILs) towards high temperatures and magnetic fields, in the enhancement of critical current densities and in the strong decrease in the dependence of ILs on frequency. In this paper we concentrate on the shutdown of the IL anisotropy (low-current regime) as well as on the decrease in the critical current density anisotropy (high-current regime). IL anisotropy is also studied as a function of the angle between the applied magnetic field and the ion tracks. The following results should be emphasized, because they are peculiar to the SCD topology. Firstly, the enhancement of the superconducting properties when the magnetic field is applied parallel to the ion tracks does not compromise the superconducting properties with the field perpendicular to the ion tracks, which are unchanged. Secondly, a dose-dependent zone of the ILs exists toward the highest temperature and lowest magnetic field), where SCDs do not affect the intrinsic properties of the material. On the contrary, a Bose-glass like phase starting just at the mentioned dose dependent point phase (T-onset, B-onset) is induced by the defects. A correlation between the two features is discussed on the basis of recent models. [References: 20]
机译：通过仅在最高达总体积的10％的顶层照射0.25 GeV金离子，在高质量的Ag /（Bi，Pb）（2）Sr2Ca2Cu3O10带中产生表面柱状缺陷（SCD）。离子束与带平面正交。这样的缺陷似乎能够将旋涡限制在直径由SCD平均距离确定的“管”内。这种局限性表现在不可逆线（ILs）向高温和磁场的转移，临界电流密度的提高以及ILs对频率的依赖性的大幅降​​低。在本文中，我们主要关注IL各向异性的关闭（低电流状态）以及临界电流密度各向异性的减小（高电流状态）。还研究了IL各向异性与所施加磁场和离子轨迹之间的角度的关系。应强调以下结果，因为它们是SCD拓扑特有的。首先，当平行于离子迹线施加磁场时，超导特性的增强不会损害垂直于离子迹线的场的超导特性，而场强不变。其次，IL的剂量依赖性区域朝向最高温度和最低磁场存在，其中SCD不会影响材料的固有特性。相反，缺陷引起刚好在所述剂量依赖性点相（T-起始，B-起始）开始的类似玻色玻璃的相。在最近的模型的基础上讨论了这两个特征之间的相关性。 [参考：20]

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