{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/28686"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/28686","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Optical dielectric properties of YBa2Cu3O6+x and Ba1-xKxBiO","abstract":"Ellipsometry is a technique that measures the change in polarization state of a beam of light on reflection from a surface. The change in polarization state can be calculated from the dielectric function of the surface and knowledge of the interface (roughness, geometry, surface layers, etc.). We have constructed a rotating analyzer ellipsometer (RAE) and modified it to allow measurement of samples significantly smaller than the extent of the incident beam (sample dimensions of about O.lmm are possible). In this work, normal state (room temperature) dielectric properties of two high temperature superconducting systems are studied as a function of doping. For the YBa2Cu3O6+x system, a sharp peak in the imaginary part of the dielectric function near 4.0eV is examined as a function of oxygen doping. The anisotropy present in this system for higher levels of doping is observed to induce a splitting in this peak that is believed to be associated with the local ordering of oxygen in the chains. For the Ba1-xKxBiO3 system, the destruction of the insulating gap and the development of a free carrier response is examined as a function of potassium doping. In this work, data from the ellipsometer is used to complement infrared reflectivity data. The result is the ability to study free carrier response over a wide range of energy.","abstract_html":"Ellipsometry is a technique that measures the change in polarization state of a beam of light on reflection from a surface. The change in polarization state can be calculated from the dielectric function of the surface and knowledge of the interface (roughness, geometry, surface layers, etc.). We have constructed a rotating analyzer ellipsometer (RAE) and modified it to allow measurement of samples significantly smaller than the extent of the incident beam (sample dimensions of about O.lmm are possible). In this work, normal state (room temperature) dielectric properties of two high temperature superconducting systems are studied as a function of doping. For the YBa2Cu3O6+x system, a sharp peak in the imaginary part of the dielectric function near 4.0eV is examined as a function of oxygen doping. The anisotropy present in this system for higher levels of doping is observed to induce a splitting in this peak that is believed to be associated with the local ordering of oxygen in the chains. For the Ba1-xKxBiO3 system, the destruction of the insulating gap and the development of a free carrier response is examined as a function of potassium doping. In this work, data from the ellipsometer is used to complement infrared reflectivity data. The result is the ability to study free carrier response over a wide range of energy.","abstract_has_math":false,"creators":["Kotz, Arthur Lewis"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Klein, Miles V."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-01-23T19:06:43Z","date_published":"2012-01-23T19:06:43Z","updated_at":"2026-07-22T22:25:27Z","subjects":["ellipsometry","YBa2Cu3O6+x","Ba1-xKxBiO"],"languages":["en"],"rights":["1992 Arthur Lewis Kotz"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/28686","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Klein, Miles V."]},{"key":"dc:creator","label":"Author","values":["Kotz, Arthur Lewis"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-01-23T19:06:43Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["ellipsometry","YBa2Cu3O6+x","Ba1-xKxBiO"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1992 Arthur Lewis Kotz"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/28686"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ellipsometry is a technique that measures the change in polarization state of a beam of light on reflection from a surface. The change in polarization state can be calculated from the dielectric function of the surface and knowledge of the interface (roughness, geometry, surface layers, etc.). We have constructed a rotating analyzer ellipsometer (RAE) and modified it to allow measurement of samples significantly smaller than the extent of the incident beam (sample dimensions of about O.lmm are possible). In this work, normal state (room temperature) dielectric properties of two high temperature superconducting systems are studied as a function of doping. For the YBa2Cu3O6+x system, a sharp peak in the imaginary part of the dielectric function near 4.0eV is examined as a function of oxygen doping. The anisotropy present in this system for higher levels of doping is observed to induce a splitting in this peak that is believed to be associated with the local ordering of oxygen in the chains. For the Ba1-xKxBiO3 system, the destruction of the insulating gap and the development of a free carrier response is examined as a function of potassium doping. In this work, data from the ellipsometer is used to complement infrared reflectivity data. The result is the ability to study free carrier response over a wide range of energy.","Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-23T19:06:43Z No. of bitstreams: 1 1992_kotz.pdf: 3365056 bytes, checksum: 6eeff6574a8e70eee2c4a670fc730912 (MD5)","Made available in DSpace on 2012-01-23T19:06:43Z (GMT). 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The change in polarization state can be calculated from the dielectric function of the surface and knowledge of the interface (roughness, geometry, surface layers, etc.). We have constructed a rotating analyzer ellipsometer (RAE) and modified it to allow measurement of samples significantly smaller than the extent of the incident beam (sample dimensions of about O.lmm are possible). In this work, normal state (room temperature) dielectric properties of two high temperature superconducting systems are studied as a function of doping. For the YBa2Cu3O6+x system, a sharp peak in the imaginary part of the dielectric function near 4.0eV is examined as a function of oxygen doping. The anisotropy present in this system for higher levels of doping is observed to induce a splitting in this peak that is believed to be associated with the local ordering of oxygen in the chains. For the Ba1-xKxBiO3 system, the destruction of the insulating gap and the development of a free carrier response is examined as a function of potassium doping. In this work, data from the ellipsometer is used to complement infrared reflectivity data. The result is the ability to study free carrier response over a wide range of energy.","Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-23T19:06:43Z No. of bitstreams: 1 1992_kotz.pdf: 3365056 bytes, checksum: 6eeff6574a8e70eee2c4a670fc730912 (MD5)","Made available in DSpace on 2012-01-23T19:06:43Z (GMT). No. of bitstreams: 1 1992_kotz.pdf: 3365056 bytes, checksum: 6eeff6574a8e70eee2c4a670fc730912 (MD5) Previous issue date: 1992","Restriction data tranferred 2014-07-01T11:11:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: dissertation","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-23T19:06:43Z Item is restricted indefinitely.","dissertation","U of I Only"],"dc:identifier":["http://hdl.handle.net/2142/28686"],"dc:language":["en"],"dc:rights":["1992 Arthur Lewis Kotz"],"dc:subject":["ellipsometry","YBa2Cu3O6+x","Ba1-xKxBiO"],"dc:title":["Optical dielectric properties of YBa2Cu3O6+x and Ba1-xKxBiO"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:27Z"}