Spin correlations in the electron-doped high-transition-temperature superconductor Nd2- xCexCuO4±δ

摘要: Inelastic magnetic neutron scattering measurements point to the distinct possibility that genuine long-range antiferromagnetism and superconductivity do not coexist. High-transition-temperature (high-Tc) develops near antiferromagnetic phases, it is possible excitations contribute superconducting pairing mechanism. To assess role of antiferromagnetism, essential understand doping temperature dependence two-dimensional spin correlations. The phase diagram asymmetric with respect electron hole doping, for comparatively less-studied electron-doped materials, extends much further doping1,2 appears overlap phase. archetypal compound Nd2-xCexCuO4±δ (NCCO) shows bulk above x ≈ 0.13 (refs 3, 4), while evidence order has been found up x ≈ 0.17 2, 5, 6). Here we report inelastic neutron-scattering data reveal a quantum critical where first appears, consistent an exotic transition between two phases7. We also demonstrate pseudogap phenomenon in which associated pronounced charge anomalies8,9,10,11, arises from build-up correlations, agreement recent theoretical proposals12,13.