Physics – Condensed Matter – Superconductivity
Scientific paper
2011-04-29
Phys. Rev. B 84, 054545 (2011)
Physics
Condensed Matter
Superconductivity
Expanded version includes results on checkerboard Hubbard ladder: 10 pages, 12 figures
Scientific paper
It has been argued that inhomogeneity generally can enhance superconductivity in the cuprate high-Tc materials. To check the validity of this claim, we study d-wave superconductivity on the checkerboard Hubbard model on a square lattice using the Cellular Dynamical Mean Field theory method with an exact diagonalization solver at zero temperature. The d-wave order parameter is computed for various inhomogeneity levels over the entire doping range of interest in both strong and weak coupling regimes. At a given doping, the size of the d-wave order parameter manifests itself directly in the height of the coherence peaks and hence is an appropriate measure of the strength of superconductivity. The weak coupling results reveal a suppression of the order parameter in the presence of inhomogeneity for small to intermediate hole dopings, while it is enhanced for large dopings. In contrast, for strong coupling there is a monotonic decrease in the maximum amplitude of the superconducting order parameter with inhomogeneity over the entire doping range of interest. Furthermore, at moderately high inhomogeneity, the system undergoes a first-order transition from the superconducting to the normal state in the underdoped regime. In the overdoped regime, the change in the value of the superconducting order parameter correlates with the height of the lowest energy peak in the spectral weight of antiferromagnetic spin fluctuations, confirming the connection between antiferromagnetic fluctuations and d-wave superconductivity found in earlier studies on the homogeneous case. Our results are benchmarked by comparisons with numerically exact results on the checkerboard Hubbard ladder.
Chakraborty Shiladitya
Sénéchal David
Tremblay A. M. -S.
No associations
LandOfFree
d-Wave superconductivity on the checkerboard Hubbard model at weak and strong coupling does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with d-Wave superconductivity on the checkerboard Hubbard model at weak and strong coupling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and d-Wave superconductivity on the checkerboard Hubbard model at weak and strong coupling will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-17121