2020/09/10 by Qianli Ma, Kirrily C. Rule, Zachary W. Cronkwright +7
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Cuprate #Doping #Inelastic neutron scattering #Magnetic and transport properties of perovskites and related materials #Neutron scattering #Phase (matter) #Physics of Superconductivity and Magnetism #Pseudogap #Quantum spin liquid #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevresearch.3.023151
published as Phys. Rev. Research 3, 023151 (2021)
arxiv created 2020/09/10 · openalex created_date 2020/09/14 · openalex publication_date 2021/05/27 · arxiv updated 2021/06/02 · openalex updated_date 2026/08/05
Three-dimensional, commensurate long-range magnetic order in La 2 CuO 4 quickly evolves to quasi-twodimensional, incommensurate correlations upon doping with mobile holes, and superconductivity follows for x as small as 0.05 in the La 2-x Sr x /Ba x CuO 4 family of superconductors. The onset of superconductivity in these systems is known to be coincident with a remarkable rotation of the incommensurate spin order from "diagonal stripes" below x = 0.05 to "parallel stripes" above. However, little is known about the spin correlations at optimal and high doping levels, around and beyond the proposed quantum critical point for the pseudogap phase, p * . Here, we present elastic and inelastic neutron scattering measurements on single crystals of La 1.6-x Nd 0.4 Sr x CuO 4 with x = 0.125, 0.19, 0.24, and 0.26 and show that two-dimensional, quasistatic, parallel spin stripes have an onset at temperatures such that the parallel spin stripe phase extends beyond p * and envelops the entirety of superconducting ground states in this system. We also show that the elastic order parameter for parallel spin stripes at optimum doping, x = 0.19, displays an inflection point at superconducting T c , while the lowenergy dynamic spectral weight of parallel stripe fluctuations grows with decreasing temperature and saturates below T c .