{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23895"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23895","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of doping on the electronic properties of niobium triselenide","abstract":"The results of magnetization, Electron Spin Resonance(ESR), and electrical resistivity measurements on both undoped and doped samples of the Charge Density Wave (CDW) material NbSe3 are reported. The magnetic studies show that both magnetic(V) and nonmagnetic(Ta) impurities may be introduced into NbSe3; a sensitive electron microscopy technique for measuring the impurity concentration is described. Magnetic impurities form delocalized states near the Fermi level, and the process by which they lose most of their magnetic moment may be qualitatively described by the Anderson modeL A broad Conduction Electron Spin Resonance(CESR) is observed in undoped, Ta doped, and V doped samples; we explain the temperature dependence of the resonance intensity, g-shift, and linewidth result from modification of the non-CDW band structure by CDW gap formation. Below the CDW transition temperatures, the resistivity is dominated by two types of carriers on the non-CDW band. Magnetoresistivity measurements indicate that electron-electron scattering of pockets of electrons dominates in un doped and lightly doped samples, while a metal-insulator transition affecting the electrons on flat sections of the same band qualitatively changes the temperature dependence of the resistivity in the more heavily doped samples. Below 1.6 K, we observe inhomogeneous superconductivity in doped NbSe3, with transition temperatures Tc depending strongly on the impurity leveL We propose that the superconductivity involves electrons on the non-CDW band and that the impurity dependence of Tc can be explained by considering the effect of impurities on the pairing interaction. We analyze the electric field dependence of the resistivity and show that the CDW depinning process may be considered an example of a dynamic critical phenomenon.","abstract_html":"The results of magnetization, Electron Spin Resonance(ESR), and electrical resistivity measurements on both undoped and doped samples of the Charge Density Wave (CDW) material NbSe3 are reported. The magnetic studies show that both magnetic(V) and nonmagnetic(Ta) impurities may be introduced into NbSe3; a sensitive electron microscopy technique for measuring the impurity concentration is described. Magnetic impurities form delocalized states near the Fermi level, and the process by which they lose most of their magnetic moment may be qualitatively described by the Anderson modeL A broad Conduction Electron Spin Resonance(CESR) is observed in undoped, Ta doped, and V doped samples; we explain the temperature dependence of the resonance intensity, g-shift, and linewidth result from modification of the non-CDW band structure by CDW gap formation. Below the CDW transition temperatures, the resistivity is dominated by two types of carriers on the non-CDW band. Magnetoresistivity measurements indicate that electron-electron scattering of pockets of electrons dominates in un doped and lightly doped samples, while a metal-insulator transition affecting the electrons on flat sections of the same band qualitatively changes the temperature dependence of the resistivity in the more heavily doped samples. Below 1.6 K, we observe inhomogeneous superconductivity in doped NbSe3, with transition temperatures Tc depending strongly on the impurity leveL We propose that the superconductivity involves electrons on the non-CDW band and that the impurity dependence of Tc can be explained by considering the effect of impurities on the pairing interaction. We analyze the electric field dependence of the resistivity and show that the CDW depinning process may be considered an example of a dynamic critical phenomenon.","abstract_has_math":false,"creators":["Aronson, Meigan Charlotte"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Salamon, Myron B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-16T20:20:49Z","date_published":"2011-05-16T20:20:49Z","updated_at":"2026-07-22T22:25:22Z","subjects":["effects of doping","electronic properties","niobium triselenide","Electron Spin Resonance (ESR)","Charge Density Wave (CDW)","magnetic impurities"],"languages":["en"],"rights":["1988 Meigan Charlotte Aronson"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["1853989"],"render_values":[{"text":"1853989","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23895","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Salamon, Myron B."]},{"key":"dc:creator","label":"Author","values":["Aronson, Meigan Charlotte"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-16T20:20:49Z","10000-01-01","1988"]},{"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":["effects of doping","electronic properties","niobium triselenide","Electron Spin Resonance (ESR)","Charge Density Wave (CDW)","magnetic impurities"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1988 Meigan Charlotte Aronson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["1853989","http://hdl.handle.net/2142/23895"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The results of magnetization, Electron Spin Resonance(ESR), and electrical resistivity measurements on both undoped and doped samples of the Charge Density Wave (CDW) material NbSe3 are reported. The magnetic studies show that both magnetic(V) and nonmagnetic(Ta) impurities may be introduced into NbSe3; a sensitive electron microscopy technique for measuring the impurity concentration is described. Magnetic impurities form delocalized states near the Fermi level, and the process by which they lose most of their magnetic moment may be qualitatively described by the Anderson modeL A broad Conduction Electron Spin Resonance(CESR) is observed in undoped, Ta doped, and V doped samples; we explain the temperature dependence of the resonance intensity, g-shift, and linewidth result from modification of the non-CDW band structure by CDW gap formation. Below the CDW transition temperatures, the resistivity is dominated by two types of carriers on the non-CDW band. Magnetoresistivity measurements indicate that electron-electron scattering of pockets of electrons dominates in un doped and lightly doped samples, while a metal-insulator transition affecting the electrons on flat sections of the same band qualitatively changes the temperature dependence of the resistivity in the more heavily doped samples. Below 1.6 K, we observe inhomogeneous superconductivity in doped NbSe3, with transition temperatures Tc depending strongly on the impurity leveL We propose that the superconductivity involves electrons on the non-CDW band and that the impurity dependence of Tc can be explained by considering the effect of impurities on the pairing interaction. We analyze the electric field dependence of the resistivity and show that the CDW depinning process may be considered an example of a dynamic critical phenomenon.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T20:20:49Z No. of bitstreams: 1 1988_aronson.pdf: 7126480 bytes, checksum: ab9882bd03624c30cdc71f0ad88241b8 (MD5)","Made available in DSpace on 2011-05-16T20:20:49Z (GMT). No. of bitstreams: 1 1988_aronson.pdf: 7126480 bytes, checksum: ab9882bd03624c30cdc71f0ad88241b8 (MD5) Previous issue date: 1988","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T20:20:49Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:29-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Effects of doping on the electronic properties of niobium triselenide"]}]}],"canonical_facts":{"dc:contributor":["Salamon, Myron B."],"dc:creator":["Aronson, Meigan Charlotte"],"dc:date":["2011-05-16T20:20:49Z","10000-01-01","1988"],"dc:description":["The results of magnetization, Electron Spin Resonance(ESR), and electrical resistivity measurements on both undoped and doped samples of the Charge Density Wave (CDW) material NbSe3 are reported. The magnetic studies show that both magnetic(V) and nonmagnetic(Ta) impurities may be introduced into NbSe3; a sensitive electron microscopy technique for measuring the impurity concentration is described. Magnetic impurities form delocalized states near the Fermi level, and the process by which they lose most of their magnetic moment may be qualitatively described by the Anderson modeL A broad Conduction Electron Spin Resonance(CESR) is observed in undoped, Ta doped, and V doped samples; we explain the temperature dependence of the resonance intensity, g-shift, and linewidth result from modification of the non-CDW band structure by CDW gap formation. Below the CDW transition temperatures, the resistivity is dominated by two types of carriers on the non-CDW band. Magnetoresistivity measurements indicate that electron-electron scattering of pockets of electrons dominates in un doped and lightly doped samples, while a metal-insulator transition affecting the electrons on flat sections of the same band qualitatively changes the temperature dependence of the resistivity in the more heavily doped samples. Below 1.6 K, we observe inhomogeneous superconductivity in doped NbSe3, with transition temperatures Tc depending strongly on the impurity leveL We propose that the superconductivity involves electrons on the non-CDW band and that the impurity dependence of Tc can be explained by considering the effect of impurities on the pairing interaction. We analyze the electric field dependence of the resistivity and show that the CDW depinning process may be considered an example of a dynamic critical phenomenon.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T20:20:49Z No. of bitstreams: 1 1988_aronson.pdf: 7126480 bytes, checksum: ab9882bd03624c30cdc71f0ad88241b8 (MD5)","Made available in DSpace on 2011-05-16T20:20:49Z (GMT). No. of bitstreams: 1 1988_aronson.pdf: 7126480 bytes, checksum: ab9882bd03624c30cdc71f0ad88241b8 (MD5) Previous issue date: 1988","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-16T20:20:49Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:14:29-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["1853989","http://hdl.handle.net/2142/23895"],"dc:language":["en"],"dc:rights":["1988 Meigan Charlotte Aronson"],"dc:subject":["effects of doping","electronic properties","niobium triselenide","Electron Spin Resonance (ESR)","Charge Density Wave (CDW)","magnetic impurities"],"dc:title":["Effects of doping on the electronic properties of niobium triselenide"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:22Z"}