Effects of the CuO chains on the anisotropic penertration depth of YBa2Cu4O8

Christos Panagopoulos, Jeffery L Tallon, Tao Xiang

The temperatuer dependence of the magnetic penetration depth of grain aligned YBa2Cu4O8 has been measured along the ab plane and c-axis. Both ${\lambda }_{a}b$ and ${\lambda }_c$ vary as \sqrt{T} up t…