Two resonant magnetic modes in an overdoped high T(c) superconductor.
Two resonant magnetic modes in an overdoped high T(c) superconductor.
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DOI：
10.1103/physrevlett.91.237002
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发表时间：
2003-08
影响因子：
8.6
通讯作者：
S. Pailhès;Y. Sidis;P. Bourges;C. Ulrich;V. Hinkov;L. Regnault;A. Ivanov;B. Liang;C. Lin;C. Bernhard;B. Keimer
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文献类型：
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作者：
S. Pailhès;Y. Sidis;P. Bourges;C. Ulrich;V. Hinkov;L. Regnault;A. Ivanov;B. Liang;C. Lin;C. Bernhard;B. Keimer
对过掺杂高温氧化铜超导体Y（0.9）Ca（0.1）Ba（2）Cu（3）O（7）的详细非弹性中子散射研究揭示了超导态下两种不同的磁共振模式。模式的不同之处在于它们的对称性相对于相邻的氧化铜层之间的交换。之前在较低的掺杂水平下观察到了具有奇对称性的模式的对应物，而不是具有偶对称性的模式。偶数模式的观测解决了一个长期存在的难题，两种模式的谱重比产生了对粒子-空穴自旋翻转激发的估计。
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor Y(0.9)Ca(0.1)Ba(2)Cu(3)O(7) reveals two-distinct magnetic resonant modes in the superconducting state. The modes differ in their symmetry with respect to exchange between adjacent copper oxide layers. Counterparts of the mode with odd symmetry, but not the one with even symmetry, had been observed before at lower doping levels. The observation of the even mode resolves a long-standing puzzle, and the spectral weight ratio of both modes yields an estimate of the onset of particle-hole spin-flip excitations.