Temperature dependence of impurity resonances in cuprate superconductors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2010
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| Online Access: | http://hdl.handle.net/1721.1/53199 |
| _version_ | 1826200571987623936 |
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| author | Chatterjee, Kamalesh |
| author2 | Eric W. Hudson. |
| author_facet | Eric W. Hudson. Chatterjee, Kamalesh |
| author_sort | Chatterjee, Kamalesh |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009. |
| first_indexed | 2024-09-23T11:38:27Z |
| format | Thesis |
| id | mit-1721.1/53199 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T11:38:27Z |
| publishDate | 2010 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/531992019-04-10T13:13:55Z Temperature dependence of impurity resonances in cuprate superconductors Chatterjee, Kamalesh Eric W. Hudson. Massachusetts Institute of Technology. Dept. of Physics. Massachusetts Institute of Technology. Dept. of Physics. Physics. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009. Cataloged from PDF version of thesis. Includes bibliographical references (p. 66-73). In conventional superconductors the superconducting gap in the electronic excitation spectrum prevents scattering of low energy electrons. In high temperature superconductors (HTS) an additional gap, the pseudogap, develops well above the superconducting transition temperature Tc. The identity of this pseudogap and its relationship to high temperature superconductivity is one of the most interesting outstanding problems in condensed matter physics today. In this thesis I present a new avenue of investigating the pseudogap state, using scanning tunneling microscopy (STM) of resonances generated by single atom scatterers. First, I report that impurity resonance peaks, near zero bias in the excitation spectrum, continue to exist above the superconducting transition temperature and prove that the impurity resonance peak is unchanged through the superconducting transition. I also show that native impurity resonances coexist spatially with the superconducting gap at low temperatures. These findings demonstrate that properties of impurity resonances in HTS are not determined by the nature of the superconducting state, as previously suggested, but instead provide new insights into the pseudogap state. I will further provide preliminary results of doping dependence as a probe to study the pseudogap. In addition to these scientific results, I will also discuss advances I have made in STM instrumentation, from a novel technology to provide the excitation for the coarse approach mechanism of the STM to current amplifier circuits for faster spectroscopy measurements. by Kamalesh Chatterjee. Ph.D. 2010-03-25T15:13:45Z 2010-03-25T15:13:45Z 2009 2009 Thesis http://hdl.handle.net/1721.1/53199 526673759 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 73 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Chatterjee, Kamalesh Temperature dependence of impurity resonances in cuprate superconductors |
| title | Temperature dependence of impurity resonances in cuprate superconductors |
| title_full | Temperature dependence of impurity resonances in cuprate superconductors |
| title_fullStr | Temperature dependence of impurity resonances in cuprate superconductors |
| title_full_unstemmed | Temperature dependence of impurity resonances in cuprate superconductors |
| title_short | Temperature dependence of impurity resonances in cuprate superconductors |
| title_sort | temperature dependence of impurity resonances in cuprate superconductors |
| topic | Physics. |
| url | http://hdl.handle.net/1721.1/53199 |
| work_keys_str_mv | AT chatterjeekamalesh temperaturedependenceofimpurityresonancesincupratesuperconductors |