Abstract
The carrier concentration dependence of electronic excitations and magnetic excitations in Bi 2Sr 2Ca 1− x Y x Cu 2O 8+ δ was systematically investigated by wide-energy Raman scattering. The B 1g electronic excitation spectrum near (π,0) is depleted below the two-magnon peak energy, which decreases with the increase of the carrier concentration. On the other hand, the B 2g spectrum near (π/2,π/2) is not depleted much. The B 1g superconducting gap energy, corresponding to the maximum energy gap, is close to the effective exchange interaction energy obtained from the two-magnon peak energy.
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