Local effects of impurities on the Pseudogap State of~Bi-2212

Some of the most surprising properties of the cuprates are found in~the pseudogap state, above the superconducting transition temperature~Tc on underdoped samples. Modifications of the local density of states (LDOS) due to the~presence of atomic impurities can unveil clues about the nature of the~pseudogap. Using atomically resolved scanning tunneling spectroscopy~we map the LDOS near Zn and Ni impurities in Bi-2212~above Tc. We find modifications of the pseudogap LDOS near both~Ni and Zn sites. We will report on the spatial dependence of these~variations~and how they relate to the underlying pseudogap state.