Magnetic Neutron Scattering in Hole-Doped Cuprate Superconductors(<Special Topic>Neutron and X-ray Scattering at the Frontiers and Gen Shirane)

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A review is presented of the static and dynamic magnetic properties of hole-doped cuprate superconductors measured with neutron scattering. A wide variety of experiments are described with emphasis on the monolayer La_<2-x>(Sr,Ba)_xCuO_4 and bilayer YBa_2Cu_3O_<6+x> cuprates. At zero hole doping, both classes of materials are antiferromagnetic insulators with large superexchange constants of J>100meV. For increasing hole doping, the cuprates become superconducting at a critical hole concentration of x_c=0.055. The development of new instrumentation at neutron beam sources coupled with the improvement in materials has lead to a better understanding of these materials and the underlying spin dynamics over a broad range of hole dopings. We will describe how the spin dispersion changes across the insulating to superconducting boundary as well as the static magnetic properties which are directly coupled with the superconductivity. Experiments probing the competing magnetic and superconducting order parameters involving magnetic fields, impurity doping, and structural order will be examined. Correlations between superconductivity and magnetism will also be discussed.
社団法人日本物理学会の論文
2006-11-15