Vortex pinning by splayed columnar defects in YBa 2 Cu 3 O 7 : Influence of large crossing angles
Vortex pinning by splayed columnar defects in YBa 2 Cu 3 O 7 : Influence of large crossing angles
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YBa 2 Cu 3 O 7 中张开柱状缺陷的涡旋钉扎：大交叉角的影响
DOI：
10.1103/physrevb.59.8455
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发表时间：
1999
影响因子：
3.7
通讯作者：
P. Lejay
中科院分区：
文献类型：
--
作者：
V. Hardy;S. Hébert;C. Goupil;C. Simon;J. Provost;M. Hervieu;P. Lejay
通过重离子辐照，在${\ mathm {YBa}}_{2}{\ mathm {Cu}}_{3}{\ mathm {O}}_{7}$晶体中安装了不同构型的柱状缺陷：与c平行的轨道的标准配置，由交叉轨道组成的双峰布局，位于$\ifmmode\pm\else\textpm\fi{}5\ifmmode \circ\else\textdegree\fi{}$，以及由交叉轨道组成的“扇形”配置，位于$\ifmmode\pm\else\textpm\fi{}5\ifmmode \circ\else\textdegree\fi{}$和$\ifmmode\pm\else\textpm\fi{} $和$\ifmmode\ circ\else\textdegree\fi{}$，其大角度的分数等于$1/5。目的是直接研究小比例大角度轨道对旋涡钉住的影响。这项研究使我们得出结论，高斯角分布的大角度尾部本身不应阻碍有利的发散效应的发生，即相对于沿c的标准辐照进一步钉住增强。
Various configurations of columnar defects have been installed by heavy-ion irradiation in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ crystals: a standard configuration of tracks parallel to c, a bimodal splay consisting of crossed tracks at $\ifmmode\pm\else\textpm\fi{}5\ifmmode^\circ\else\textdegree\fi{}$ to the c axis, and a ``fan'' configuration consisting of crossed tracks at $\ifmmode\pm\else\textpm\fi{}5\ifmmode^\circ\else\textdegree\fi{}$ and $\ifmmode\pm\else\textpm\fi{}45\ifmmode^\circ\else\textdegree\fi{},$ with a fraction of large angles equal to $1/5.$ The aim is to directly investigate the influence of a small proportion of tracks at large angle on the vortex pinning. This study leads us to conclude that the large-angle tail of a Gaussian angular distribution should not, in itself, impede the occurrence of a beneficial splay effect, i.e., a further pinning enhancement relative to a standard irradiation along c.