Physics – Condensed Matter – Superconductivity
Scientific paper
1997-11-09
Physics
Condensed Matter
Superconductivity
5 pages, 4 EPS figures; SNS'97 Proceedings to appear in J. Phys. Chem. Solids
Scientific paper
10.1016/S0022-3697(98)00135-8
For YBa_2Cu_3O_{6+\delta} and Bi_2Sr_2CaCu_2O_8 superconductors, electronic Raman scattering from high- and low-energy excitations has been studied in relation to the hole doping level, temperature, and energy of the incident photons. For underdoped superconductors, it is concluded that short range antiferromagnetic (AF) correlations persist with hole doping and doped single holes are incoherent in the AF environment. Above the superconducting (SC) transition temperature T_c the system exhibits a sharp Raman resonance of B_1g symmetry and about 75 meV energy and a pseudogap for electron-hole excitations below 75 meV, a manifestation of a partially coherent state forming from doped incoherent quasi-particles. The occupancy of the coherent state increases with cooling until phase ordering at T_c produces a global SC state.
Blumberg Girsh
Guptasarma Prasenjit
Hinks D.
Kadowaki Kazuo
Kendziora Chris
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