Magnetic Fluctuations of Stripes in the High Temperature Cuprate Superconductors (original) (raw)
2005, Physical Review Letters
Within the time-dependent Gutzwiller approximation for the Hubbard model we compute the magnetic fluctuations of vertical metallic stripes with parameters appropriate for La1.875Ba0.125CuO4 (LBCO). For bond-and site-centered stripes the excitation spectra are similar, consisting of a low-energy incommensurate acoustic branch which merges into a "resonance peak" at the antiferromagnetic wave vector and several high-energy optical branches. The acoustic branch is similar to the result of theories assuming localized spins whereas the optical branches are significantly different. Results are in good agreement with a recent inelastic neutron study of LBCO. PACS numbers: 74.25.Ha,71.28.+d,71.45.lr Since the discovery of cuprate superconductors the elucidation of their magnetic properties has been a subject of intense research in the high-T c community due to their possible relevance for the superconducting mechanism[1]. However, no consensus has been reached yet wether the magnetic excitation spectra in the various cuprate materials can be traced back to some universal phenomenology which could be expected in the face of the robust nature of superconductivity. The insulating parent compounds show long-range antiferromagnetic (AF) order in the CuO 2 planes below the Néel temperature[2]. This static AF order is lost above a concentration of added holes per planar copper x ≈ 0.02 but complex dynamical spin correlations persist up to the overdoped regime .
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