Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor BSCCO
Vershinin, Michael
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https://hdl.handle.net/2142/80508
Description
Title
Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor BSCCO
Author(s)
Vershinin, Michael
Issue Date
2004
Doctoral Committee Chair(s)
Yazdani, Ali
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The key results at 100 K are our observation of local electronic ordering below the pseudogap energy scale and our failure to observe any tell-tale signs of local superconductivity at Ni impurity sites in the pseudogap regime of a high-TC superconductor. The observation of electronic ordering in the pseudogap regime is a novel and indeed a highly unexpected result. The existence of such a phenomenon is likely to have substantial impact on our understanding of the pseudogap regime. Our tunneling spectroscopy observations at the Ni sites reveal a clear difference between the electronic states above and below TC. This is a novel result in its own right. It unambiguously shows that single electron spectroscopy can observe sharp differences between the various cuprate phases. This observation makes STM a valuable tool and holds the promise of using it to map out electronic states and phases across the entire phase diagram.
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