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We report on superconducting(SC) characteristics for oxygen-reduced Cu-basedfive-layered high-temperature superconductor (Cu,C)Ba2Ca4Cu5Oy(Cu-1245(OPT)),which includes five-fold outer planes (OP) and four-fold inner planes (IP).As aresult of the reduction of the carrier density, the bulk SC for Cu-1245 (OPT)takes place at the nearly optimally-doped OP with Tc= 98 K that is differentfrom previously-reported Cu-1245(OVD) where IP plays a primary role for theonset of SC. It gives an evidence that the carrier density of theoptimally-doped layer determines its bulk Tc.Static antiferromagnetic(AFM)order is evidenced at IP's by zero-field Cu-NMR at low temperature,irrespective of the SC transition at OP's below 98K. This AFM state at IP's ischaracterized by a carrier localization at low temperatures due to disordereffect, whereas the carrier densities in each layer are similar to Hg-1245(OPT)where the AFM metallic state are realized in IP's. This finding reinforces thephase diagram in which the AFM metallic phase exists between AFM insulator andSC states for the case of ideally-flat CuO2 plane without disorder.Comment: 4 pages, 5 figure

journal of the physical society of japan

Disorder-Driven Quantum Phase Transition from Antiferromagnetic Metal to Insulating State in Multilayered High-Tc Cuprate (Cu,C)Ba2Ca4Cu5Oy