Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides

Autor:	Chubukov, Andrey V., Eremin, Ilya, Korshunov, Maxim M.
Rok vydání:	2009
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 79, 220501(R) (2009)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.79.220501
Popis:	We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that $A_{1g}$ Raman intensity has a true resonance peak below $2\Delta$ for extended s-wave superconducting gap, $\Delta(\mathbf{k}) = \Delta (\cos k_x + \cos k_y)/2$ in the folded Brillouin zone. No such peak emerges for a pure s-wave gap, a d-wave gap, and another extended s-wave gap with $\Delta(\mathbf{k}) = \Delta \cos{\frac{k_x}{2}} \cos{\frac{k_y}{2}}$ proposed by several groups. Comment: 5 pages, 3 figures, discussion on the vertex corrections is extended
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0901.2102 Zobrazit plný text záznamu View this record from Arxiv