Imaging the essential role of spin-fluctuations in high-Tc superconductivity

Details Imaging the essential role of spin-fluctuations in high-Tc superconductivity Imaging the essential role of spin-fluctuations in high-Tc superconductivity

2009-09-02

arxiv.org/abs/0909.0500v1

Phys. Rev. Lett. 103, 227001 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.227001

We have used scanning tunneling spectroscopy to investigate short-length electronic correlations in three-layer Bi2Sr2Ca2Cu3O(10+d) (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 anti-correlated. 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.

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