Single crystals of Hg-12(n−l) have been grown using high-pressure gas-technique. Due to the high density of Ar gas at 10 kbar the evaporation of Hg is strongly suppresed. An influence of structure defects on magnetic properties will be discussed. Superconducting parameters λ ab ,ξ ab and γ have been studied using torque magnetometry. Layers of Hg-1201 compound have been grown from flux.
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