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

Unurbat Erdenemunkh, Brian Koopman, Ling Fu, Kamalesh Chatterjee, W. D. Wise, G. D. Gu, E. W. Hudson, Michael C. Boyer

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Abstract

We use scanning tunneling microscopy (STM) to study magnetic Fe impurities intentionally doped into the high-temperature superconductor Bi2Sr2CaCu2O8+δ. Our spectroscopic measurements reveal that Fe impurities introduce low-lying resonances in the density of states at Ω1≈4 meV and Ω2≈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 nonmagnetic impurities in these materials.

Original languageEnglish (US)
Article number257003
JournalPhysical Review Letters
Volume117
Issue number25
DOIs
StatePublished - Dec 16 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Erdenemunkh, U., Koopman, B., Fu, L., Chatterjee, K., Wise, W. D., Gu, G. D., Hudson, E. W., & Boyer, M. C. (2016). Suppression of Superfluid Density and the Pseudogap State in the Cuprates by Impurities. Physical Review Letters, 117(25), [257003]. https://doi.org/10.1103/PhysRevLett.117.257003