Abstract
By using the Hao–Clem model, we analyzed the equilibrium magnetization of the grain-aligned HgBa 2Ca 4Cu 5O 12+ y (Hg1245) with T c ≃ 108 K . We obtained thermodynamic parameters, such as the penetration depth [ λ ab ( 0 ) ] and the coherence length [ ξ ab ( 0 ) ] from the thermodynamic critical field [ H c ] and the Ginzburg–Landau parameter [ κ ] . Compared to the four layered superconductor HgBa 2Ca 3Cu 4O 10+ y (Hg1234), the obtained penetration depth was slightly increased indicating that the Cooper pair density of Hg1245 was decreased, which was one of the reasons why the transition temperature ( T c ) of the Hg1245 did not increase as compared to the Hg1234. The expected increase of T c for the material with the more CuO 2 planes was not achieved because of the insufficient doping of the Cooper pairs while adding CuO 2 planes.
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