Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-26
Journal of Magnetism and Magnetic Materials 321, 216-221 (2009)
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, typos corrected and updated references, accepted for publication in Journal of Magnetism and Magnetic Mate
Scientific paper
10.1016/j.jmmm.2008.08.106
The influence of a uniform external magnetic field on the dynamical spin response of cuprate superconductors in the superconducting state is studied based on the kinetic energy driven superconducting mechanism. It is shown that the magnetic scattering around low and intermediate energies is dramatically changed with a modest external magnetic field. With increasing the external magnetic field, although the incommensurate magnetic scattering from both low and high energies is rather robust, the commensurate magnetic resonance scattering peak is broadened. The part of the spin excitation dispersion seems to be an hourglass-like dispersion, which breaks down at the heavily low energy regime. The theory also predicts that the commensurate resonance scattering at zero external magnetic field is induced into the incommensurate resonance scattering by applying an external magnetic field large enough.
Cheng Li
Feng Shiping
Guo Huaiming
Zhang Jingge
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