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Principles of Electron Tunneling SpectroscopySecond Edition$
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E. L. Wolf

Print publication date: 2011

Print ISBN-13: 9780199589494

Published to Oxford Scholarship Online: January 2012

DOI: 10.1093/acprof:oso/9780199589494.001.0001

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Scanning tunneling spectroscopy of superconducting cuprates and magnetic manganites

Scanning tunneling spectroscopy of superconducting cuprates and magnetic manganites

(p.447) 10 Scanning tunneling spectroscopy of superconducting cuprates and magnetic manganites
Principles of Electron Tunneling Spectroscopy

E. L. Wolf

Oxford University Press

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

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