Universal properties of modulated antiferromagnetic systems

摘要: Magnetism and superconductivity are physical phenomena whose foundations rooted in quantum mechanics technological applications do not cease to surprise us. In this article we describe a class of magnetic materials, call modulated antiferromagnetic systems (MAS), that has prominent representative the copper-oxide high-temperature superconductors. The class, however, is exclusive these Indeed, several materials belong insulators. spectral weight MAS displays following universal properties: local intensity maximum (resonance peak) at commensurate wave vector; peaks nearly-antiferromagnetic vectors for excitation energies well below resonance, rotated by 45 degrees above resonance. Moreover, predict an observable rotation immediately All signatures, condensed twisted hour-glass-like spectrum, merely consequences unique topological characteristics single-particle dispersion relation. We thus provide unifying scenario explains phenomenology been observed inelastic neutron scattering experiments