Marginal Fermi liquid resonance induced by a quantum magnetic impurity in d-wave superconductors |
| |
Authors: | Zhang G M Hu H Yu L |
| |
Institution: | Center for Advanced Studies, Tsinghua University, Beijing, China. |
| |
Abstract: | We consider a model of an Anderson impurity embedded in a d(x(2)-y(2))--wave superconducting state to describe the low-energy excitations of cuprate superconductors doped with a small amount of magnetic impurities. Because of the Dirac-like energy dispersion, a sharp localized resonance above the Fermi energy, showing a marginal Fermi liquid behavior ( omega ln omega as omega-->0), is predicted for the impurity states. The same logarithmic dependence of self-energy and a linear frequency dependence of the relaxation rate are also derived for the conduction electrons, characterizing a new universality class for the strong coupling fixed point. At the resonant energies, the spatial distribution of the electron density of states around the magnetic impurity is also calculated. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|