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Using a real-space renormalization group (RSRG) technique, the microwave conductivity of a d-wave superconductor disordered by extended impurities is calculated. To do this, a semiclassical approximation is invoked which naturally accesses the Andreev bound states localized near each impurity. Tunneling corrections (which are captured using the RSRG) lead to a delocalization of these quasiparticles and an associated contribution to the microwave conductivity. © 2003 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics