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Model calculations of Raman responses for multiband iron-based superconductors
Descriptive
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Text
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Title
Model calculations of Raman responses for multiband iron-based superconductors
SubTitle
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ETD_1962
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000052002
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eng
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theses
Subject
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Topic
Physics and Astronomy
Subject
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(authority = ETD-LCSH)
Topic
Raman effect
Subject
(ID = SBJ-3);
(authority = ETD-LCSH)
Topic
Superconductors
Abstract
In this thesis I compute Raman responses for a free electron band structure model based on ARPES measurements on multiband iron-based superconductors. First a constant and then a k-dependent superconducting gap is used. Applying an effective mass approximation leaves A1g and B2g as the only nonvanishing symmetry channels. In the latter only one band contributes and a square root singularity is observed for a constant gap. The k-dependent gap leads to a threshold-log-singularity structure. The unscreened A1g channel shows the same features but all bands contribute and sum up. The screened single band A1g response vanishes for both gaps. Two band responses with the same constant gap are perfectly screened with identical Raman verteces, unscreened with opposite signs and equal mass ratios and partially screened in all other cases. With two different constant gaps the singularities are removed and a dome-like shape appears except for the vanishing case of equal verteces. The n-band response consists of a sum of two band terms normalized by all n bands and the singularities corresponding to all uniquely present gap values are removed. With the k-dependent gap the singularities are removed and a dome-like shape appears in all combinations of two band responses and in the response for all bands. The dome in the response for all bands shows a at continuum in between a threshold and a sharp peak produced by the two band terms containing bands of opposite signs.
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electronic resource
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xi, 113 p. : ill.
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M.S.
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Includes bibliographical references (p. 107-113)
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by Christoph Sauer
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Sauer
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Christoph
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1984-
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Christoph Sauer
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Blumberg
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Girsh
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chair
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Girsh Blumberg
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Coleman
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Piers
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internal member
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Piers Coleman
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Wu
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Weida
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Weida Wu
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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2009
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2009-10
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xx
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Rutgers University Electronic Theses and Dissertations
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ETD
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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doi:10.7282/T3R78FD4
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ETD graduate
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The author owns the copyright to this work.
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Copyright protected
Notice
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Open
Reason
Permission or license
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Sauer
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Christoph
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Christoph Sauer
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Rutgers University. Graduate School - New Brunswick
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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9738240
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