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We report on the observation of high-T_c superconductivity (SC) emerging withthe background of an antiferromagnetic (AFM) order in the five-layered cuprateBa_2Ca_4Cu_5O_10(F,O)_2 through 19F-NMR and zero-field Cu-NMR studies. Themeasurements of spectrum and nuclear spin-lattice relaxation rates 19(1/T_1) of19F-NMR give convincing evidence for the AFM order taking place below T_N = 175K and for the onset of SC below T_c = 52 K, hence both coexisting. Thezero-field Cu-NMR study has revealed that AFM moments at Cu sites are 0.14 mu_Bat outer CuO_2 layers and 0.20 mu_B at inner ones. We remark that an intimatecoupling exists between the AFM state and the SC order parameter below T_c = 52K; the spin alignment in the AFM state is presumably changed in the SC-AFMmixed state.

journal of the physical society of japan

High-T_c Superconductivity with T_c = 52 K under Antiferromagnetic Order  in Five-layered Cuprate Ba_2Ca_4Cu_5O_10(F,O)_2 with T_N = 175 K: 19F- and  Cu-NMR Studies