Based on the t- t′ -U-V model with proper chosen parameters for describing the cuprate superconductors, it is found that near the optimal doping at low temperature (T), only the pure d -wave superconductivity (dSC) prevails and the antiferromagnetic (AF) order is completely suppressed. At higher T, the AF order with stripe modulation and the accompanying charge order may emerge, and they could exist above the dSC transition temperature. We calculate the local differential tunneling conductance (LDTC) from the local density of states (LDOS) and show that their energy variations are rather different from each other as T increases. Although the calculated modulation periodicity in the LDTC/LDOS and bias energy dependence of the Fourier amplitude of LDTC in the "pseudogap" region are in good agreement with the recent scanning tunnel microscope experiment [Vershinin, Science 303, 1995 (2004)], we point out that some of the energy-dependent features in the LDTC do not represent the intrinsic characteristics of the sample.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2005 Dec 14|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics