Effect of Antiferromagnetic Order on Mixed States in Electron-Doped High-Tc Superconductors

The vortex states in electron-doped high-Tc superconductors are studied theoretically at the mean-field approach and based on the Bogoliubov-de Gennes equations. The local density of states is calculated, through which the in-gap bound states are revealed. They are robust at the sites around the vortex core. In the underdoped region where the antiferromagnetic order and the superconducting order coexist, the in-gap peaks are lying symmetric with respect to the Fermi energy, while the peak intensities at the negative energy are much stronger. A stripe-type modulation is revealed for the spin-resolved local density of states. As the doping density increases to the optimal or over-doped region, the long-range antiferromagnetic order disappears, and the two in-gap peaks merge to one single peak. The peak position is near the Fermi energy. Our results indicate that the vortex states may be used to detect the signature of the antiferromagnetic order in electron-doped high-Tc superconductors.

Automated summary

Theoretical study on vortex states in electron-doped high-Tc superconductors using the mean-field approach and Bogoliubov-de Gennes equations reveals in-gap bound states and their characteristics. The presence of antiferromagnetic order and superconducting order in the underdoped region leads to symmetric in-gap peaks around the Fermi energy, with stronger intensities at negative energy. As doping density increases, the long-range antiferromagnetic order disappears and two in-gap peaks merge into one near the Fermi energy, suggesting that vortex states can be utilized to detect the signature of antiferromagnetic order in electron-doped high-Tc superconductors.