Hidden one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba2CuO3+y superconductors
Paul Worm, Motoharu Kitatani, Jan M. Tomczak, Liang Si, Karsten Held
DOI 10.1103/PhysRevB.105.085110 · Physical Review B
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Abstract
All previous cuprate superconductors display a set of common features: (i) vicinity to a Cu 3d9 configuration; (ii) separated CuO2 planes; and (iii) superconductivity for doping δ∼0.1–0.3. Recently, Li et al. [Proc. Natl. Acad. Sci. USA 116, 12156 (2019)] challenged this picture by discovering “highly overdoped” superconducting Ba2CuO3+y. Using density-functional theory plus dynamical mean-field theory, we reveal a bilayer structure of Ba2CuO3.2 of alternating quasi-two-dimensional (2D) and quasi-one-dimensional (1D) character. Correlations tune an interlayer self-doping leading to an almost half-filled, strongly nested, quasi-1D db2−c2 band, which is prone to strong antiferromagnetic fluctuations, possibly at the origin of superconductivity in Ba2CuO3+y.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2CuO3+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
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