Charge trapping and super-Poissonian noise centres in a cuprate superconductor

K. M. Bastiaans, D. Cho, T. Benschop, I. Battisti, Y. Huang, M. S. Golden, Q. Dong, Y. Jin, J. Zaanen, M. P. Allan

Research output: Contribution to journalLetter

3 Citations (Scopus)

Abstract

The electronic properties of cuprate high-temperature superconductors in their normal state are highly two-dimensional: transport along the crystal planes is perfectly metallic, but is insulating along the perpendicular ‘c-axis’ direction. The ratio of the in-plane to the perpendicular resistance can exceed 10 4 (refs 1–4 ). This anisotropy was identified as one of the mysteries of the cuprates early on 5,6 , and although widely different proposals exist for its microscopic origin 7–9 , there is little empirical information on the microscopic scale. Here, we elucidate the properties of the insulating layers with a newly developed scanning noise spectroscopy technique that can spatially map the current and its time-resolved fluctuations. We discover atomic-scale noise centres that exhibit megahertz current fluctuations 40 times the expectation from Poissonian noise, more than what has been observed in mesoscopic systems 10 . Such behaviour can happen only in highly polarizable insulators and represents strong evidence for trapping of charge in the charge reservoir layers. Our measurements suggest a picture of metallic layers separated by polarizable insulators within a three-dimensional superconducting state.

Original languageEnglish
Pages (from-to)1183-1187
Number of pages5
JournalNature Physics
Volume14
Issue number12
DOIs
Publication statusPublished - 2018 Dec 1

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cuprates
trapping
insulators
high temperature superconductors
proposals
anisotropy
scanning
electronics
spectroscopy
crystals

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Bastiaans, K. M., Cho, D., Benschop, T., Battisti, I., Huang, Y., Golden, M. S., ... Allan, M. P. (2018). Charge trapping and super-Poissonian noise centres in a cuprate superconductor. Nature Physics, 14(12), 1183-1187. https://doi.org/10.1038/s41567-018-0300-z
Bastiaans, K. M. ; Cho, D. ; Benschop, T. ; Battisti, I. ; Huang, Y. ; Golden, M. S. ; Dong, Q. ; Jin, Y. ; Zaanen, J. ; Allan, M. P. / Charge trapping and super-Poissonian noise centres in a cuprate superconductor. In: Nature Physics. 2018 ; Vol. 14, No. 12. pp. 1183-1187.
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Bastiaans, KM, Cho, D, Benschop, T, Battisti, I, Huang, Y, Golden, MS, Dong, Q, Jin, Y, Zaanen, J & Allan, MP 2018, 'Charge trapping and super-Poissonian noise centres in a cuprate superconductor', Nature Physics, vol. 14, no. 12, pp. 1183-1187. https://doi.org/10.1038/s41567-018-0300-z

Charge trapping and super-Poissonian noise centres in a cuprate superconductor. / Bastiaans, K. M.; Cho, D.; Benschop, T.; Battisti, I.; Huang, Y.; Golden, M. S.; Dong, Q.; Jin, Y.; Zaanen, J.; Allan, M. P.

In: Nature Physics, Vol. 14, No. 12, 01.12.2018, p. 1183-1187.

Research output: Contribution to journalLetter

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AU - Huang, Y.

AU - Golden, M. S.

AU - Dong, Q.

AU - Jin, Y.

AU - Zaanen, J.

AU - Allan, M. P.

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Bastiaans KM, Cho D, Benschop T, Battisti I, Huang Y, Golden MS et al. Charge trapping and super-Poissonian noise centres in a cuprate superconductor. Nature Physics. 2018 Dec 1;14(12):1183-1187. https://doi.org/10.1038/s41567-018-0300-z