Fe Impurities in Bi$_{\mathrm{2}}$Sr$_{\mathrm{2}}$CaCu$_{\mathrm{2}}$O$_{\mathrm{8+\delta }}$

We present our low-temperature scanning tunneling microscopy (STM) measurements on magnetic Fe impurities intentionally doped in Bi$_{\mathrm{2}}$Sr$_{\mathrm{2}}$CaCu$_{\mathrm{2}}$O$_{\mathrm{8+\delta }}$ (BSCCO). Our high-energy-resolution spectral maps allow us to detail the effects Fe impurities have on the local density of states. Combining the results of our STM measurements with those of previously studied Zn and Ni impurities in BSCCO, we conclude that potential scattering of quasiparticles dominates magnetic scattering even for impurities with large magnetic moments. In addition, we show evidence that impurities act to locally suppress both superconducting and pseudogap states.