{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19570"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19570","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Interlayer optical response of yttrium barium (copper (cobalt, zinc)) oxide","abstract":"We report optical reflectance and spectroscopic ellipsometry measurements of the in- and out-of-plane dielectric responses of chain substituted $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ and $\\rm YBa\\sb2(Cu\\sb{1 - y}Co\\sb{y})\\sb3O\\sb{6 + x}$ and of plane substituted $\\rm YBa\\sb2(Cu\\sb{1 - y}Zn\\sb{y})\\sb3O\\sb{6 + x}.$ A dramatic decrease in the low-frequency c-axis optical conductivity, $\\sigma\\sb{\\rm c}(\\omega),$ is observed with either O reduction or Co substitution, suggesting that structural changes in the Cu(1)-O(4)-Cu(2) complex between the CuO$\\sb2$ bilayers dominate the doping dependence of interlayer coupling in $\\rm YBa\\sb2(Cu\\sb{1 - y}M\\sb{y})\\sb3O\\sb{6 + x}$ (M = Co, Zn). The slight decrease in $\\sigma\\sb{\\rm c}(\\omega)$ observed with Zn substitution suggests that the charge dynamics in the CuO$\\sb2$ planes play at best a minor role in regulating interlayer hopping. We find that the electronic component of the c-axis optical conductivity in $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ is roughly constant below 800 cm$\\sp{-1}$, and is well fit over the frequency range 800 cm$\\rm\\sp{-1} \\le\\omega\\le3200\\ cm\\sp{-1}$ by $\\sigma\\sb{\\rm c}(\\omega)\\propto\\omega\\sp\\gamma\\ (0 \\le\\gamma<1.2),$ for all oxygen concentrations $\\rm 0.26 \\le x \\le 0.93.$ The consequences of these results for theories of c-axis transport in the cuprates are discussed. Absorption bands near 0.95 and 2.7 eV in $\\sigma\\sb{\\rm c}(\\omega)$ are assigned to plane-to-chain antibonding band transitions, while the c-axis polarized 1.7 eV absorption is attributed to charge transfer transitions between O and Cu atoms in adjacent CuO$\\sb2$ planes of a bilayer. We consider the proposed connection between the pseudogap in the c-axis optical conductivity, and the deviations from linearity in the in- and out-of-plane resistivity, and discuss the possibility that either interlayer dynamic disorder or low-q spin scattering may account for these unusual features. Notably, c-axis polarized electronic Raman scattering measurements are discussed that provide evidence for a specific incoherent contribution to $\\sigma\\sb{c}(\\omega)$ resulting from optical phonon assisted interlayer hopping.","abstract_html":"We report optical reflectance and spectroscopic ellipsometry measurements of the in- and out-of-plane dielectric responses of chain substituted $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ and $\\rm YBa\\sb2(Cu\\sb{1 - y}Co\\sb{y})\\sb3O\\sb{6 + x}$ and of plane substituted $\\rm YBa\\sb2(Cu\\sb{1 - y}Zn\\sb{y})\\sb3O\\sb{6 + x}.$ A dramatic decrease in the low-frequency c-axis optical conductivity, <span class=\"etd-inline-math\">&sigma;\\sb{\\rm c}(&omega;),</span> is observed with either O reduction or Co substitution, suggesting that structural changes in the Cu(1)-O(4)-Cu(2) complex between the CuO$\\sb2$ bilayers dominate the doping dependence of interlayer coupling in $\\rm YBa\\sb2(Cu\\sb{1 - y}M\\sb{y})\\sb3O\\sb{6 + x}$ (M = Co, Zn). The slight decrease in <span class=\"etd-inline-math\">&sigma;\\sb{\\rm c}(&omega;)</span> observed with Zn substitution suggests that the charge dynamics in the CuO$\\sb2$ planes play at best a minor role in regulating interlayer hopping. We find that the electronic component of the c-axis optical conductivity in $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ is roughly constant below 800 cm$\\sp{-1}$, and is well fit over the frequency range 800 cm<span class=\"etd-inline-math\">\\rm\\sp{-1} \\le&omega;\\le3200 cm\\sp{-1}</span> by <span class=\"etd-inline-math\">&sigma;\\sb{\\rm c}(&omega;)\\propto&omega;\\sp&gamma; (0 \\le&gamma;&lt;1.2),</span> for all oxygen concentrations $\\rm 0.26 \\le x \\le 0.93.$ The consequences of these results for theories of c-axis transport in the cuprates are discussed. Absorption bands near 0.95 and 2.7 eV in <span class=\"etd-inline-math\">&sigma;\\sb{\\rm c}(&omega;)</span> are assigned to plane-to-chain antibonding band transitions, while the c-axis polarized 1.7 eV absorption is attributed to charge transfer transitions between O and Cu atoms in adjacent CuO$\\sb2$ planes of a bilayer. We consider the proposed connection between the pseudogap in the c-axis optical conductivity, and the deviations from linearity in the in- and out-of-plane resistivity, and discuss the possibility that either interlayer dynamic disorder or low-q spin scattering may account for these unusual features. Notably, c-axis polarized electronic Raman scattering measurements are discussed that provide evidence for a specific incoherent contribution to <span class=\"etd-inline-math\">&sigma;\\sb{c}(&omega;)</span> resulting from optical phonon assisted interlayer hopping.","abstract_has_math":true,"creators":["Karlow, Marvin Anthony"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Wolfe, J.P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:11:45Z","date_published":"2011-05-07T12:11:45Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":["Copyright 1996 Karlow, Marvin Anthony"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591087970","AAI9702554","(UMI)AAI9702554"],"render_values":[{"text":"9780591087970","href":null,"code":true},{"text":"AAI9702554","href":null,"code":true},{"text":"(UMI)AAI9702554","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19570","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wolfe, J.P."]},{"key":"dc:creator","label":"Author","values":["Karlow, Marvin Anthony"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:11:45Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["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."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Condensed Matter"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Karlow, Marvin Anthony"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591087970","AAI9702554","(UMI)AAI9702554","http://hdl.handle.net/2142/19570"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We report optical reflectance and spectroscopic ellipsometry measurements of the in- and out-of-plane dielectric responses of chain substituted $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ and $\\rm YBa\\sb2(Cu\\sb{1 - y}Co\\sb{y})\\sb3O\\sb{6 + x}$ and of plane substituted $\\rm YBa\\sb2(Cu\\sb{1 - y}Zn\\sb{y})\\sb3O\\sb{6 + x}.$ A dramatic decrease in the low-frequency c-axis optical conductivity, $\\sigma\\sb{\\rm c}(\\omega),$ is observed with either O reduction or Co substitution, suggesting that structural changes in the Cu(1)-O(4)-Cu(2) complex between the CuO$\\sb2$ bilayers dominate the doping dependence of interlayer coupling in $\\rm YBa\\sb2(Cu\\sb{1 - y}M\\sb{y})\\sb3O\\sb{6 + x}$ (M = Co, Zn). The slight decrease in $\\sigma\\sb{\\rm c}(\\omega)$ observed with Zn substitution suggests that the charge dynamics in the CuO$\\sb2$ planes play at best a minor role in regulating interlayer hopping. We find that the electronic component of the c-axis optical conductivity in $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ is roughly constant below 800 cm$\\sp{-1}$, and is well fit over the frequency range 800 cm$\\rm\\sp{-1} \\le\\omega\\le3200\\ cm\\sp{-1}$ by $\\sigma\\sb{\\rm c}(\\omega)\\propto\\omega\\sp\\gamma\\ (0 \\le\\gamma<1.2),$ for all oxygen concentrations $\\rm 0.26 \\le x \\le 0.93.$ The consequences of these results for theories of c-axis transport in the cuprates are discussed. Absorption bands near 0.95 and 2.7 eV in $\\sigma\\sb{\\rm c}(\\omega)$ are assigned to plane-to-chain antibonding band transitions, while the c-axis polarized 1.7 eV absorption is attributed to charge transfer transitions between O and Cu atoms in adjacent CuO$\\sb2$ planes of a bilayer. We consider the proposed connection between the pseudogap in the c-axis optical conductivity, and the deviations from linearity in the in- and out-of-plane resistivity, and discuss the possibility that either interlayer dynamic disorder or low-q spin scattering may account for these unusual features. Notably, c-axis polarized electronic Raman scattering measurements are discussed that provide evidence for a specific incoherent contribution to $\\sigma\\sb{c}(\\omega)$ resulting from optical phonon assisted interlayer hopping.","Made available in DSpace on 2011-05-07T12:11:45Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702554.pdf: 6905275 bytes, checksum: 59ece5f5dd94c6fd34d751261b2708fa (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:37:56Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:41-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Interlayer optical response of yttrium barium (copper (cobalt, zinc)) oxide"]}]}],"canonical_facts":{"dc:contributor":["Wolfe, J.P."],"dc:creator":["Karlow, Marvin Anthony"],"dc:date":["2011-05-07T12:11:45Z","10000-01-01","1996"],"dc:description":["We report optical reflectance and spectroscopic ellipsometry measurements of the in- and out-of-plane dielectric responses of chain substituted $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ and $\\rm YBa\\sb2(Cu\\sb{1 - y}Co\\sb{y})\\sb3O\\sb{6 + x}$ and of plane substituted $\\rm YBa\\sb2(Cu\\sb{1 - y}Zn\\sb{y})\\sb3O\\sb{6 + x}.$ A dramatic decrease in the low-frequency c-axis optical conductivity, $\\sigma\\sb{\\rm c}(\\omega),$ is observed with either O reduction or Co substitution, suggesting that structural changes in the Cu(1)-O(4)-Cu(2) complex between the CuO$\\sb2$ bilayers dominate the doping dependence of interlayer coupling in $\\rm YBa\\sb2(Cu\\sb{1 - y}M\\sb{y})\\sb3O\\sb{6 + x}$ (M = Co, Zn). The slight decrease in $\\sigma\\sb{\\rm c}(\\omega)$ observed with Zn substitution suggests that the charge dynamics in the CuO$\\sb2$ planes play at best a minor role in regulating interlayer hopping. We find that the electronic component of the c-axis optical conductivity in $\\rm YBa\\sb2Cu\\sb3O\\sb{6 + x}$ is roughly constant below 800 cm$\\sp{-1}$, and is well fit over the frequency range 800 cm$\\rm\\sp{-1} \\le\\omega\\le3200\\ cm\\sp{-1}$ by $\\sigma\\sb{\\rm c}(\\omega)\\propto\\omega\\sp\\gamma\\ (0 \\le\\gamma<1.2),$ for all oxygen concentrations $\\rm 0.26 \\le x \\le 0.93.$ The consequences of these results for theories of c-axis transport in the cuprates are discussed. Absorption bands near 0.95 and 2.7 eV in $\\sigma\\sb{\\rm c}(\\omega)$ are assigned to plane-to-chain antibonding band transitions, while the c-axis polarized 1.7 eV absorption is attributed to charge transfer transitions between O and Cu atoms in adjacent CuO$\\sb2$ planes of a bilayer. We consider the proposed connection between the pseudogap in the c-axis optical conductivity, and the deviations from linearity in the in- and out-of-plane resistivity, and discuss the possibility that either interlayer dynamic disorder or low-q spin scattering may account for these unusual features. Notably, c-axis polarized electronic Raman scattering measurements are discussed that provide evidence for a specific incoherent contribution to $\\sigma\\sb{c}(\\omega)$ resulting from optical phonon assisted interlayer hopping.","Made available in DSpace on 2011-05-07T12:11:45Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702554.pdf: 6905275 bytes, checksum: 59ece5f5dd94c6fd34d751261b2708fa (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:37:56Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:15:41-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591087970","AAI9702554","(UMI)AAI9702554","http://hdl.handle.net/2142/19570"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Karlow, Marvin Anthony"],"dc:subject":["Physics, Condensed Matter"],"dc:title":["Interlayer optical response of yttrium barium (copper (cobalt, zinc)) oxide"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:14Z"}