Magnetsim, Fluctuations and Mechanism of High-Temperature Superconductivity

29th International Symposium on Superconductivity

Yanagisawa, Takashi^1 ; Hase, Izumi^1 ; Miyazaki, Mitake^2 ; Yamaji, Kunihiko^1

Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba

305-8568, Japan^1

Hakodate National College of Technology, 14-1 Tokura, Hakodate

042-8501, Japan^2

关键词: Condensation energies;    Crossover regions;    Gap functions;    High-temperature superconductivity;    Level difference;    Superconducting condensation energy;    Two-dimensional d-p model;    Variational Monte Carlo method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012015/pdf
DOI  :  10.1088/1742-6596/871/1/012015

来源: IOP

【 摘 要 】

We investigate the ground state of the two-dimensional d-p model (three-band Hubbard model) by using a variational Monte Carlo method. The superconducting condensation energy is evaluated for the Gutzwiller-BCS wave function. We show that there is a crossover between strongly and weakly correlated regions as the level difference between d and p orbitals increases. The gap function and the condensation energy can be large in the crossover region. This result indicates a possibility of high-temperature superconductivity in the two-dimensional d-p model.