Abstract
We report dc magnetization measurements on the first available HgBa2CuO4+δ and HgBa2Ca2Cu3O8+δ (respectively Hg1201 and Hg1223) superconducting single crystals, for fields applied both perpendicular and parallel to the CuO2 planes. In the regime where the magnetization is reversible and linear in logarithm of the applied field, we have used the 3D London theory to determine the penetration depth λab for in-plane currents (λab(0)≃1300±100A, for Hg1201 and ≈1500±100A for Hg1223). Using a relation derived from the anisotropic Ginzburg-Landau approach, we have made an estimate of the anisotropy factor (γ≈30 for Hg1201 and γ≈50 for Hg1223). The results are in agreement with recent torque experiments on Hg1223.
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