Uniform Mixing of Antiferromagnetism and High-Temperature Superconductivity in Electron-Doped Layers of Four-Layered Ba2Ca3Cu4O8F2: A New Phenomenon in an Electron Underdoped Regime
S. Shimizu, H. Mukuda, Y. Kitaoka, A. Iyo, Y. Tanaka, Y. Kodama, K. Tokiwa, T. Watanabe
DOI 10.1103/PhysRevLett.98.257002 · Physical Review Letters
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Abstract
We report Cu63,65- and F19-NMR studies on a four-layered high-temperature superconductor Ba2Ca3Cu4O8F2((0234F(2.0)) with apical fluorine (F−1), an undoped 55 K superconductor with a nominal Cu2+ valence on average. We reveal that this compound exhibits the antiferromagnetism (AFM) with a Néel temperature TN=100 K despite being a Tc=55 K superconductor. Through a comparison with a related trilayered cuprate Ba2Ca2Cu3O6F2(0233F(2.0)), it is demonstrated that electrons are transferred from the inner plane (IP) to the outer plane (OP) in 0234F(2.0) and 0223F(2.0), confirming the self-doped high-temperature superconductivity (HTSC) having electron and hole doping in a single compound. Remarkably, uniform mixing of AFM and HTSC takes place in both the electron-doped OPs and the hole-doped IPs in 0234F(2.0).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2Ca3Cu4O8F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
| Ba2Ca2Cu3O6F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76 | Pressure not reported | onset |
| HgBa2Ca4Cu5Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure not reported | unknown |
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