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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 22
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Phys. Rev. Lett. 103, 227001 (2009) [4 pages]

Imaging the Essential Role of Spin Fluctuations in High-Tc Superconductivity

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N. Jenkins1, Y. Fasano1,2, C. Berthod1, I. Maggio-Aprile1, A. Piriou1, E. Giannini1, B. W. Hoogenboom3, C. Hess4, T. Cren5, and Ø. Fischer1
1DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
2Instituto Balseiro and Centro Atómico Bariloche, San Carlos de Bariloche, Argentina
3London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
4Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, Dresden 01171, Germany
5Institut des Nano-Sciences de Paris, Universités Paris 6 et Paris 7 et CNRS (UMR 75 88), 140 rue de Lourmel, Campus Boucicaut, Paris 75015, France

Received 6 August 2008; revised 14 September 2009; published 23 November 2009

We have used scanning tunneling spectroscopy to investigate short-length electronic correlations in three-layer Bi2Sr2Ca2Cu3O10+δ (Bi-2223). We show that the superconducting gap and the energy Ωdip, 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 Ωdip 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 (π, π) spin resonance.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.227001
DOI:
10.1103/PhysRevLett.103.227001
PACS:
74.50.+r, 74.20.Mn, 74.72.Hs
 
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