Influence of a magnetic field on the electronic Raman response in high-Tc cuprates

✍ Scribed by Hong-Min Jiang; Jian-Xin Li

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 352 KB
• Volume: 451
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.10.004

✦ Synopsis

The effect of a magnetic field parallel to the CuO 2 plane on the Raman spectra is investigated based on the Slave-Boson approach to the t À t 0 À J model with a Zeeman field and the random-phase approximation. We find that the Raman spectra intensities in the superconducting (SC) state are suppressed for both the B 1g and the B 2g channels with a slight shift of the peaks position toward lower frequency in the B 1g channel and a negligible shift in the B 2g channel due to the Zeeman splitting. There is a field-induced peak and dip structure at low energy response in the B 2g channel at very low temperature. While rising temperature has a similar effect in reducing the Raman response peak in the superconducting (SC) state, it smears out the field-induced peak and dip structure in the B 2g channel. We compare these results with experiments and give explanations based on the field-induced changes of the density of the superconducting condensate, the momentum distribution of the quasiparticle energy and the scattering rate.