Suppression of Superfluid Density and the Pseudogap State in the Cuprates by Impurities

Abstract

We use scanning tunneling microscopy (STM) to study magnetic Fe impurities intentionally doped into the high-temperature superconductor Bi${}_2$Sr${}_2$Ca${}_2$CuO${}_{8+\delta }$. Our spectroscopic measurements reveal that Fe impurities introduce low-lying resonances in the density of states at Ω${}_1$ $\approx$ 4meV and Ω${}_2$ $\approx$ 15 meV allowing us to determine that, despite having a large magnetic moment, potential scattering of quasiparticles by Fe impurities dominates magnetic scattering. In addition, using high-resolution spatial characterizations of the local density of states near and away from Fe impurities, we detail the spatial extent of impurity affected regions as well as provide a local view of impurity-induced effects on the superconducting and pseudogap states. Our studies of Fe impurities, when combined with a reinterpretation of earlier STM work in the context of a two-gap scenario, allow us to present a unified view of the atomic-scale effects of elemental impurities on the pseudogap and superconducting states in hole-doped cuprates; this may help resolve a previously assumed dichotomy between the effects of magnetic and non-magnetic impurities in these materials.

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Cited by in corpus (2)

• Field-free platform for topological zero-energy mode in superconductors LiFeAs and PbTaSe${}_2$
• Direct Visualization of a Static Incommensurate Antiferromagnetic Order by Suppressing the Superconducting Phase Coherence in Fe-doped Bi2Sr2CaCu2O8+delta