Evolution of Magnetic and Superconducting Fluctuations with Doping of High-Tc Superconductors (An electronic Raman scattering study)

Abstract

For YBa_2Cu_3O_{6+δ} 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.

5 pages, 4 EPS figures; SNS'97 Proceedings to appear in J. Phys. Chem. Solids

References in corpus (2)

• Spin-Gap Proximity Effect Mechanism of High Temperature Superconductivity
• Multiband Electronic Raman Scattering in Bilayer Superconductors

Cited by in corpus (7)

• Nonmonotonic d_{x^2-y^2} Superconducting Order Parameter in Nd_{2-x}Ce_xCuO_4
• Evolution of Superconductivity in Electron-Doped Cuprates: Magneto-Raman Spectroscopy
• On the 590cm-1 B1g feature in underdoped Bi2Sr2CaCu2O8+delta
• Doping dependence of the superconducting gap in Bi2Sr2CaCu2O{8 + delta}
• Resonance mode in $B_{1g}$ Raman scattering -- a way to distinguish between spin-fluctuation and phonon-mediated $d-$wave superconductivity
• Electronic Raman Scattering in Superconducting Cuprates
• Raman resonance in spin S two-leg ladder systems