{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19161"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19161","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Resistivity and paraconductivity in the high-temperature superconductor yttrium barium(2) copper(3) oxygen(7-y)","abstract":"We have measured the normal state resistivity of well characterized polycrystalline, twinned-single crystal, and twin-free single crystal samples of superconducting YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The resistivity was linear in temperature for all samples far from T$\\sb{\\rm c}$.","abstract_html":"We have measured the normal state resistivity of well characterized polycrystalline, twinned-single crystal, and twin-free single crystal samples of superconducting YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The resistivity was linear in temperature for all samples far from T$\\sb{\\rm c}$.","abstract_has_math":true,"creators":["Friedmann, Thomas Aquinas"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Ginsberg, Donald M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T11:58:48Z","date_published":"2011-05-07T11:58:48Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":["Copyright 1991 Friedmann, Thomas Aquinas"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124414","(UMI)AAI9124414"],"render_values":[{"text":"AAI9124414","href":null,"code":true},{"text":"(UMI)AAI9124414","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19161","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ginsberg, Donald M."]},{"key":"dc:creator","label":"Author","values":["Friedmann, Thomas Aquinas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T11:58:48Z","10000-01-01","1991"]},{"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 1991 Friedmann, Thomas Aquinas"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9124414","(UMI)AAI9124414","http://hdl.handle.net/2142/19161"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have measured the normal state resistivity of well characterized polycrystalline, twinned-single crystal, and twin-free single crystal samples of superconducting YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The resistivity was linear in temperature for all samples far from T$\\sb{\\rm c}$.","In polycrystalline samples the deviation from linearity near T$\\sb{\\rm c}$ has been analyzed in terms of the Aslamazov-Larkin three-dimensional (AL3D) fluctuation model on six separate samples. The value of the BCS superconducting-coherence length in the clean limit, $\\xi\\sb0$(0) = 13.4 $\\pm$ 4.2A, has been extracted from the analysis. The Ginzburg criterion have been used to estimate H$\\sb{\\rm c2}$ $\\cong$ 500 kG.","We have measured the ab plane resistivity of a twinned-single crystal of YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The data were fit to the Maki-Thompson, Aslamazov-Larkin, and Lawrence-Doniach (LD) models. All three theories could be fit to the data, but the LD theory gave the best fit, with physically reasonable parameters. We find that the Ginzburg-Landau coherence length in the c direction, extrapolated to low temperature, is approximately 0.44 A.","The resistivity tensor $\\rho\\sb{\\rm a}$, $\\rho\\sb{\\rm b}$, and $\\rho\\sb{\\rm c}$, has been measured on two twin-free single crystal samples using a modified Montgomery technique. The room-temperature values of $\\rho\\sb{\\rm a}$ and $\\rho\\sb{\\rm b}$ are as small as any reported in the literature, which indicates good sample quality. The anisotropy ratio $\\rho\\sb{\\rm a}$/$\\rho\\sb{\\rm b}$, has been determined for the first time. Between 150K and 275K, the anisotropy ratio is temperature independent, and is equal to 2.2 $\\pm$ 0.2. This results is in good agreement with recent infrared conductivity data measured by Schlesinger et al., and is also indicative of highly ordered chains. The $\\rho\\sb{\\rm b}$ data show very little deviation from linearity near T$\\sb{\\rm c}$. The small rounding proves to be consistent with simple fluctuation theories; and it is possible to fit the a and b directions consistently to the LD and AL two-dimensional fluctuation models.","Made available in DSpace on 2011-05-07T11:58:48Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124414.pdf: 8296760 bytes, checksum: 40d90b481009e75296cfd219769a4806 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:35:04Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:40-05:00 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":["Resistivity and paraconductivity in the high-temperature superconductor yttrium barium(2) copper(3) oxygen(7-y)"]}]}],"canonical_facts":{"dc:contributor":["Ginsberg, Donald M."],"dc:creator":["Friedmann, Thomas Aquinas"],"dc:date":["2011-05-07T11:58:48Z","10000-01-01","1991"],"dc:description":["We have measured the normal state resistivity of well characterized polycrystalline, twinned-single crystal, and twin-free single crystal samples of superconducting YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The resistivity was linear in temperature for all samples far from T$\\sb{\\rm c}$.","In polycrystalline samples the deviation from linearity near T$\\sb{\\rm c}$ has been analyzed in terms of the Aslamazov-Larkin three-dimensional (AL3D) fluctuation model on six separate samples. The value of the BCS superconducting-coherence length in the clean limit, $\\xi\\sb0$(0) = 13.4 $\\pm$ 4.2A, has been extracted from the analysis. The Ginzburg criterion have been used to estimate H$\\sb{\\rm c2}$ $\\cong$ 500 kG.","We have measured the ab plane resistivity of a twinned-single crystal of YBa$\\sb2$Cu$\\sb3$O$\\sb{\\rm 7-y}$. The data were fit to the Maki-Thompson, Aslamazov-Larkin, and Lawrence-Doniach (LD) models. All three theories could be fit to the data, but the LD theory gave the best fit, with physically reasonable parameters. We find that the Ginzburg-Landau coherence length in the c direction, extrapolated to low temperature, is approximately 0.44 A.","The resistivity tensor $\\rho\\sb{\\rm a}$, $\\rho\\sb{\\rm b}$, and $\\rho\\sb{\\rm c}$, has been measured on two twin-free single crystal samples using a modified Montgomery technique. The room-temperature values of $\\rho\\sb{\\rm a}$ and $\\rho\\sb{\\rm b}$ are as small as any reported in the literature, which indicates good sample quality. The anisotropy ratio $\\rho\\sb{\\rm a}$/$\\rho\\sb{\\rm b}$, has been determined for the first time. Between 150K and 275K, the anisotropy ratio is temperature independent, and is equal to 2.2 $\\pm$ 0.2. This results is in good agreement with recent infrared conductivity data measured by Schlesinger et al., and is also indicative of highly ordered chains. The $\\rho\\sb{\\rm b}$ data show very little deviation from linearity near T$\\sb{\\rm c}$. The small rounding proves to be consistent with simple fluctuation theories; and it is possible to fit the a and b directions consistently to the LD and AL two-dimensional fluctuation models.","Made available in DSpace on 2011-05-07T11:58:48Z (GMT). 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