Model for Tunneling-mediated Impurity Resonances in Bilayer Cuprate Superconductors
arXiv:0810.2043 · doi:10.1103/PhysRevB.79.092501
Abstract
We have studied tunneling-mediated local density of states (LDOS) of the surface layer of a bilayer cuprate, where a Zn impurity is located on the second Cu-O layer. When the tunneling strength between two Cu-O layers is larger than a critical value, the LDOS on the site just above the Zn impurity first exhibits a resonant peak near the Fermi surface. The larger the tunneling strength, the stronger the resonant peak. It is also shown that the height of the resonant peak oscillates decreasingly with the distance from the site just above the Zn impurity. The location of the resonant peak in the surface LDOS depends on doping, energy gap, and the tunneling strength, and has an opposite bias voltage to that on its nearest neighboring sites. The results could be tested by the STM experiments and be used to further understand the electronic properties of high temperature superconductors.
5 pages, 4 figures
References in corpus (11)
- Angle-resolved photoemission spectroscopy of the cuprate superconductors
- How to detect fluctuating order in the high-temperature superconductors
- Scanning tunneling spectroscopy of high-temperature superconductors
- Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
- Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
- SO(5) Theory of Antiferromagnetism and Superconductivity
- Bilayer Splitting in the Electronic Structure of Heavily Overdoped Bi2Sr2CaCu2O8+d
- Doubling of the bands in overdoped Bi2Sr2CaCu2O8-probable evidence for c-axis bilayer coupling
- Impurity states and interlayer tunneling in high temperature superconductors
- The Energy-dependent Checkerboard Patterns in Cuprate Superconductors
- Coulomb Interaction-induced Checkerboard Patterns in Disordered Cuprates