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In a recent letter, Chatterjee et al. (Nature Phys. 4, 108 (2008)) reportedtunnelling data obtained below and above the critical temperature (Tc = 15 K)by STM in overdoped Bi2-yPbySr2CuO6+x (Bi2201) and some interpretations of thedata1. The main experimental findings of their work are observations ofnative-impurity resonances which coexist spatially with the superconducting(SC) gap below Tc and survive unchanged on warming through Tc. No doubts, thedata in the letter are an important piece of information for assembling thehigh-Tc SC jigsaw puzzle; however, there are inaccuracies in the discussion. Inaddition, I propose another interpretation of the data.

Comment on Visualization of the interplay between high-temperature superconductivity, the pseudogap and impurity resonances