Influence of d-Wave Symmetry on Irreversibility Line and Critical Current Densities(Superconductors)
Influence of d-Wave Symmetry on Irreversibility Line and Critical Current Densities(Superconductors)
复制标题
d波对称性对不可逆线和临界电流密度的影响（超导体）
DOI：
10.1143/jjap.40.l1022
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发表时间：
2001
影响因子：
1.5
通讯作者：
Kazuo Watanabe
中科院分区：
文献类型：
--
作者：
S. Awaji;Kazuo Watanabe
由于二维d波超导体dx2-y2-和dxy-对称性的混合，理论上提出了低温强磁场区上临界场Bc2的增强。在Bc2增强理论的基础上，利用BiBc2n的幂定律，计算了高温超导体的不可逆场Bi和临界电流密度Jc。结果表明，化学气相沉积(CVD)制备的YBa2Cu3O7中的Bi和JC都能用本模型很好地解释。这一事实表明，对于二维d波超导体，Bi和Jc的凹形温度依赖关系来源于Bc2。此外，高温超导体的Bi值随各向异性的变化不大，但随各向异性参数γ_2的增大而急剧减小。
The enhancement of the upper critical field, Bc2, in a low temperature and high magnetic field region has been proposed theoretically, due to the mixing of dx2-y2 - and dxy-symmetries for two-dimensional (2D) d-wave superconductors. Based on the Bc2 enhancement theory, the irreversibility field, Bi, and the critical current density, Jc, for high-Tc superconductors were calculated using the power law of Bi ∝Bc2n. It is found that both Bi and Jc for chemical vapor deposition (CVD)-processed YBa2Cu3O7 can be well interpreted by the present model. This fact suggests that the concave temperature dependences of Bi and Jc originate from Bc2 for 2D d-wave superconductors. Moreover, the qualitative temperature dependence of Bi for high-Tc superconductors changes slightly with the anisotropy but the value of Bi decreases drastically with increasing the anisotropic parameter γ2.