Effects of the CuO chains on the anisotropic penertration depth of YBa2Cu4O8
Christos Panagopoulos, Jeffery L Tallon, Tao Xiang
Abstract
The temperatuer dependence of the magnetic penetration depth of grain aligned YBa2Cu4O8 has been measured along the ab plane and c-axis. Both λab and λc vary as T up to 0.4Tc implying a square root density of states at low energy. The results are discussed in terms of a proximity model of alternating stacked superconducting and normal layers
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