Magnetic field induced incommensurate resonance in cuprate superconductors
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- 作者：Jingge Zhang ; Li Cheng ; Huaiming Guo ; Shiping Feng
- 关键词：Magnetic scattering ; Incommensurate resonance ; Hourglass-like dispersion ; Cuprate superconductor
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2009
- 出版时间：February 2009
- 年：2009
- 卷：321
- 期：3
- 页码：216-221
- 全文大小：592 K
文摘
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.