Temperature dependent Scanning Tunneling Spectroscopy of impurities in Bi2Sr2CuO6+x through the transition temperature

Scanning Tunneling Microscopy has been used to study detailed electronic spectrum in atomic scale defects in high temperature superconductors. We present Scanning Tunneling Spectroscopy of impurities in Bi$_{2}$Sr$_{2}$CuO$_{6+x }$(Bi-2201) over a wide range of temperatures. Surprisingly, native impurity resonances, similar to the ones previously observed in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$ (Bi-2212), spatially coexist with the superconducting gap at low temperatures and survive almost unchanged through the superconducting transition temperature T$_{c}$. We shall discuss the implications of these findings on the relationship between superconducting gap and pseudogap in these materials.