ANISOTROPIC PENETRATION DEPTH MEASUREMENTS OF HIGH-T-C SUPERCONDUCTORS

A systematic study of the anisotropic magnetic penetration depth lambd a for several high-T-c superconductors is presented. It is shown that the existence of the linear term in the low temperature in-plane penet ration depth is independent of the number of CuO2 planes per unit cell , the carrier concentration and the anisotropy. The anisotropy, howeve r, is found to have strong effects in the out-of-plane component. The effects of Zn substitution on lambda and the importance of the CuO2 pl anes for d(x)2(-y)2 pairing are discussed.