Impurities and quantum interference in the chains of YBa2Cu3O6+x |
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Authors: | Morr Dirk K Balatsky Alexander V |
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Affiliation: | Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA. |
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Abstract: | Motivated by recent experiments, we study the electronic structure near impurities in the chains of YBa2Cu3O6+x. Using a model of proximity induced chain superconductivity, we show that a resonance state in the chain density of states is induced only by a magnetic impurity. The spatial form of the resonance reflects the particle-hole nature of chain superconductivity and therefore distinguishes it from other broken symmetry phases. Because of quantum interference effects between impurities, the chains can undergo a quantum phase transition into a polarized state. |
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