2017/02/16 by Manfred Bucher, Bucher, Manfred
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #General Physics (physics.gen-ph) #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism
paper · pdf · doi:10.48550/arxiv.1702.05364
openalex publication_date 2017/02/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The contribution of O2- ions to antiferromagnetism in La2-xAexCuO4 (Ae = Sr, Ba) is highly sensitive to doped holes. In contrast, the contribution of Cu2+ ions to antiferromagnetism in Nd2-xCexCuO4+y is much less sensitive to doped electrons. The difference causes the precarious and, respectively, robust antiferromagnetic phase of these cuprates. The same sensitivities affect the doping dependence of the incommensurability of density waves, δ(x). In the hole-doped compounds this gives rise to a doping offset for magnetic and charge density waves, δm,cp(x) ∝ √x-x0pN. Here x0pN is the doping concentration where the Néel temperature vanishes, TN(x0pN) = 0. No such doping offset occurs for density waves in the electron-doped compound. Instead, excess oxygen (necessary for stability in crystal growth) of concentration y causes a different doping offset in the latter case, δm,cn(x) ∝ √(x- 2y). The square-root formulas result from the assumption of superlattice formation through partitioning of the CuO2 plane by pairs of itinerant charge carriers. Agreement of observed incommensurability δ(x) with the formulas is very good for the hole-doped compounds and reasonable for the electron-doped compound. The deviation in the latter case may be caused by residual excess oxygen.