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In contrast to the "Pr-issue" that neither PrBa2Cu3O7 (Pr123) nor PrBa2Cu4O8(Pr124) shows superconductivity (SC), we have observed 100%-fraction of SC inan oxygen-reduced Pr2Ba4Cu7O(15-delta) (Pr247) which has a hybrid structurethat Pr247 = Pr123 + Pr124. It is found that Cu nuclear-spin signals from theCuO2 planes observed at 300K are completely wiped out down at 2K. Instead,plane signals at 2K are observed at higher frequencies. This indicates that,despite the bulk SC, the CuO2 planes in Pr247 are found to be in an insulatingand antiferromagnetically ordered state.

Nuclear-spin evidence of insulating and antiferromagnetic state of CuO2 planes in superconducting Pr2Ba4Cu7O15-{\delta}