Relation between the superconducting gap energy and the two-magnon Raman peak energy in Bi2Sr2Ca1-xYxCu2O8+δ
S. Sugai, T. Hosokawa
Abstract
The relation between the electronic excitation and the magnetic excitation for the superconductivity in Bi2Sr2Ca1-xYxCu2O8+δ was investigated by wide-energy Raman spectroscopy. In the underdoping region the B1g scattering intensity is depleted below the two-magnon peak energy due to the "hot spots" effects. The depleted region decreases according to the decrease of the two-magnon peak energy, as the carrier concentration ncreases. This two-magnon peak energy also determines the B1g superconducting gap energy as 2Δ≈ α ω Two-Magnon ≈ J effective (α=0.34-0.41) from under to overdoping hole concentration.
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