Marginal Fermi liquid resonance induced by a quantum magnetic impurity in d-wave superconductors.
نویسندگان
چکیده
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.
منابع مشابه
THE ABDUS SALAM INTERNATIONAL CENTRE FOR THEORETICAL PHYSICS MARGINAL FERMI LIQUID RESONANCE INDUCED BY A QUANTUM MAGNETIC IMPURITY IN d-WAVE SUPERCONDUCTORS
We consider a model of an Anderson impurity embedded in a dx2_y2-w&ve superconducting state to describe the low-energy excitations of cuprate superconductors doped with a small amount of magnetic impurities. Due to the Dirac-like energy dispersion, a sharp localized resonance above the Fermi energy, showing a marginal Fermi liquid behavior (wlnw as w ->0), is predicted for the impurity states. ...
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ورودعنوان ژورنال:
- Physical review letters
دوره 86 4 شماره
صفحات -
تاریخ انتشار 2001