Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba$_2$CuO$_{3+y}$ superconductors

Paul Worm; Motoharu Kitatani; Jan M. Tomczak; Liang Si; Karsten Held

doi:10.1103/PhysRevB.105.085110

paper

Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba $_{2}$ CuO $_{3 + y}$ superconductors

arXiv:2107.11897 · doi:10.1103/PhysRevB.105.085110

Abstract

All previous cuprate superconductors display a set of common features: (i) vicinity to a Cu 3 $d^{9}$ configuration; (ii) separated CuO $_{2}$ planes; (iii) superconductivity for doping $δ \sim$ 0.1 $-$ 0.3. Recently [PNAS {\bf 24}, 12156 (2019)] challenged this picture by discovering "highly overdoped" superconducting Ba $_{2}$ CuO $_{3 + y}$ . Using density-functional theory + dynamical mean-field theory, we reveal a bilayer structure of Ba $_{2}$ CuO $_{3.2}$ of alternating quasi 2D and quasi 1D character. Correlations tune an inter-layer self-doping leading to an almost half-filled, strongly nested quasi 1D $d_{b^{2} - c^{2}}$ band, which is prone to strong antiferromagnetic fluctuations, possibly at the origin of superconductivity in Ba $_{2}$ CuO $_{3 + y}$ .

Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba $_{2}$ CuO $_{3 + y}$ superconductors

Abstract

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Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba2​CuO3+y​ superconductors

Abstract

References in corpus (8)

Cited by in corpus (4)

Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in Ba $_{2}$ CuO $_{3 + y}$ superconductors