Doping and temperature dependence of electronic Raman response in cuprate superconductors

TL;DR

This study investigates how doping and temperature affect the electronic Raman response in cuprate superconductors, revealing symmetry-dependent depletion shifts and doping-related changes in pair-breaking peaks and Cooper pair density.

Contribution

It introduces a kinetic energy driven superconducting mechanism within the t-J model to explain doping and temperature effects on Raman response in cuprates, highlighting symmetry and doping dependencies.

Findings

Faster low-energy depletion shift in B_{1g} symmetry with temperature.

Doping-dependent pair-breaking peak energy peaks at optimal doping.

Cooper pair density increases with doping in the underdoped regime.

Abstract

The doping and temperature dependence of the electronic Raman response in cuprate superconductors is studied within the framework of the kinetic energy driven superconducting mechanism for the t-J model. It is shown that the temperature dependent depletion at low-energy shifts is faster in B_{1g} symmetry than in B_{2g} symmetry. In analogy to the domelike shape of the doping dependent superconducting transition temperature, the pair-breaking peak energy in B_{2g} channel increases with increasing doping in the underdoped regime, and reaches a maximum in the optimal doping, then decreases in the overdoped regime. Moreover, the overall Cooper pair density increases with increasing doping in the underdoped regime.