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Imaging the Essential Role of Spin Fluctuations in High-T-c Superconductivity

Jenkins, N; Fasano, Y; Berthod, C; Maggio-Aprile, I; Piriou, A; Giannini, E; Hoogenboom, BW; ... Fischer, O; + view all (2009) Imaging the Essential Role of Spin Fluctuations in High-T-c Superconductivity. PHYS REV LETT , 103 (22) , Article 227001. 10.1103/PhysRevLett.103.227001. Green open access

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Abstract

We have used scanning tunneling spectroscopy to investigate short-length electronic correlations in three-layer Bi2Sr2Ca2Cu3O10+delta (Bi-2223). We show that the superconducting gap and the energy Omega(dip), defined as the difference between the dip minimum and the gap, are both modulated in space following the lattice superstructure and are locally anticorrelated. Based on fits of our data to a microscopic strong-coupling model, we show that Omega(dip) is an accurate measure of the collective-mode energy in Bi-2223. We conclude that the collective mode responsible for the dip is a local excitation with a doping dependent energy and is most likely the (pi, pi) spin resonance.

Type: Article
Title: Imaging the Essential Role of Spin Fluctuations in High-T-c Superconductivity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.103.227001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.103.227001
Language: English
Additional information: © 2009 The American Physical Society
Keywords: SCANNING TUNNELING SPECTROSCOPY, SINGLE-CRYSTALS, BI2SR2CACU2O8+DELTA, DENSITY, STATES, PHOTOEMISSION, EXCITATIONS, RESONANCE, INTERPLAY, SPECTRA
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/128273
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