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We report Cu- and F-NMR studies on a four-layered high-temperaturesuperconductor Ba2Ca3Cu4O8F2(0234F(2.0)) with apical fluorine (F-1), an undoped55 K-superconductor with a nominal Cu2+ valence on average. We reveal that thiscompound exhibits the antiferromagnetism (AFM) with a Neel temperature TN=100 Kdespite being a Tc= 55 K-superconductor. Through a comparison with a relatedtri-layered cuprate Ba2Ca2Cu3O6F2 (0223F(2.0)), it is demonstrated thatelectrons are transferred from the inner plane (IP) to the outer plane (OP) in0234F(2.0) and 0223F(2.0), confirming the self-doped high-temperaturesuperconductivity (HTSC) having electron and hole doping in a single compound.Remarlably, uniform mixing of AFM and HTSC takes place in both theelectron-doped OPs and the hole-doped IPs in 0234F(2.0).

physical review letters

Uniform Mixing of Antiferromagnetism and High-Tc Superconductivity in  Electron-doped Layers in Four-layered Ba2Ca3Cu4O8F2 : A New Phenomenon in an  Electron Underdoped RegimePhenomenon in an Electron Underdoped Regime