Munzar D, Cardona M
Institute of Condensed Matter Physics, Masaryk University, Kotlárská 2, CZ-61137 Brno, Czech Republic.
Phys Rev Lett. 2003 Feb 21;90(7):077001. doi: 10.1103/PhysRevLett.90.077001. Epub 2003 Feb 18.
The spectacular changes of the A(1g)-polarized Raman spectra of trilayer and four-layer high-T(c) cuprate superconductors below T(c) observed in recent experiments can be explained in terms of a new type of excitation that occurs in these systems, a Raman active c-axis plasmon. Its frequency, intensity, resonance properties, polarization properties, and coupling to phonon modes involving vibrations of the planar oxygens are estimated and shown to agree with those of the observed A(1g) superconductivity-induced electronic peak.
近期实验中观察到的三层和四层高温铜酸盐超导体在临界温度(T_c)以下的(A_{1g})偏振拉曼光谱的显著变化，可以用这些体系中出现的一种新型激发——拉曼活性(c)轴等离子体激元来解释。对其频率、强度、共振特性、偏振特性以及与涉及平面氧振动的声子模式的耦合进行了估算，结果表明与观测到的(A_{1g})超导诱导电子峰的特性相符。
