Chapter

Scanning tunneling spectroscopy of superconducting cuprates and magnetic manganites

E. L. Wolf

in Principles of Electron Tunneling Spectroscopy

Second edition

Published in print November 2011 | ISBN: 9780199589494
Published online January 2012 | e-ISBN: 9780191731334 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199589494.003.0010

Series: International Series of Monographs on Physics

Scanning tunneling spectroscopy of superconducting cuprates and magnetic manganites

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Gap imaging STS using a lattice-tracking variable-temperature scanning tunnelling microscope is applied to HTC cuprate superconductor Bi2212. The results indicate an anti-correlation between local gap and local zero-bias density of states. No correlation is found between gap and strength of the boson-like dip feature. This chapter concludes that the driving force for the pairing is of electronic origin. An internal proximity effect between neighbouring regions is found in the observed growth of superconductivity with temperature. The localized state induced by a Zn impurity is displayed and theoretically explicated. The superlattice modulation in Bi2212 is described, as is the charge ordering within flux-line cores. The relation between STS and angle resolved photoemission spectroscopy ARPES is explained. Features of colossal magnetoresistive CMR ferromagnetic manganites are explicated with STS.

Keywords: STS; ARPES; anti-correlation; proximity; coherence; Fourier-transform; Bi2212; manganite; CMR

Chapter.  8682 words.  Illustrated.

Subjects: Condensed Matter Physics

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