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Erdenemunkh U, Koopman B, Fu L, Chatterjee K, Wise WD, Gu GD, Hudson EW, Boyer MC. Suppression of Superfluid Density and the Pseudogap State in the Cuprates by Impurities. PHYSICAL REVIEW LETTERS 2016; 117:257003. [PMID: 28036192 DOI: 10.1103/physrevlett.117.257003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Indexed: 06/06/2023]
Abstract
We use scanning tunneling microscopy (STM) to study magnetic Fe impurities intentionally doped into the high-temperature superconductor Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}. Our spectroscopic measurements reveal that Fe impurities introduce low-lying resonances in the density of states at Ω_{1}≈4 meV and Ω_{2}≈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.
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Affiliation(s)
- Unurbat Erdenemunkh
- Department of Physics, Clark University, Worcester, Massachusetts 01610, USA
| | - Brian Koopman
- Department of Physics, Clark University, Worcester, Massachusetts 01610, USA
| | - Ling Fu
- Department of Physics, Clark University, Worcester, Massachusetts 01610, USA
| | - Kamalesh Chatterjee
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - W D Wise
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - G D Gu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - E W Hudson
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Physics, Pennsylvania State University, State College, Pennsylvania 16802, USA
| | - Michael C Boyer
- Department of Physics, Clark University, Worcester, Massachusetts 01610, USA
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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