{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25307"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25307","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effect of manganese doping on the superconducting transition temperature and the upper critical field of tin-molybdenum-sulfide","abstract":"We have measured the superconducting transition temperature, Tc' and the upper critical field, Hc2 (T), of manganese-doped SnMo6S8 (MnxSn1_xMo6S8)' These samples had reproducible superconducting properties. They were characterized by x-ray powder diffractometry, optical microscopy. electron microscopy, and electron microprobe work. The transition temperature decreased slow1~ with increasing manganese content until x=O.06. It then increased until x=O.10. after which it fell slow1~ again. Manganese would norma11y have strong pair-breaking effects on the quasipartic1es, but our results provide an exception. X-ray Absorbtion Near-Edge Structure (XANES) measurements showed that the manganese exists as Mn+6 in our compound. Six of its seven valence electrons are transfered to the MoS 68 clusters of the compound. As Mn+6 has on1~ one valence electron in the 3-d orbital we expect it to be on1y slight1y magnetic. This helps to explain the low rate of T c depression. T for these compounds is dependent on the number c of electrons available to the mo1ibdenum atoms, and it peaks when this number is optimized. The peak in the T curve is c explained b~ considering the extra electrons transfered to the mo1ibdenum as the manganese doping is increased. H(T) curves upward from 0 to 15 kOe and is linear from c2 15 to 30 kOe. The curvature of the low-field section increases as the manganese doping is raised from x=O.O to x=0.06. Above x=0.06 the curvature does not change. The slope of the linear section does not vary with manganese content.","abstract_html":"We have measured the superconducting transition temperature, Tc' and the upper critical field, Hc2 (T), of manganese-doped SnMo6S8 (MnxSn1_xMo6S8)' These samples had reproducible superconducting properties. They were characterized by x-ray powder diffractometry, optical microscopy. electron microscopy, and electron microprobe work. The transition temperature decreased slow1~ with increasing manganese content until x=O.06. It then increased until x=O.10. after which it fell slow1~ again. Manganese would norma11y have strong pair-breaking effects on the quasipartic1es, but our results provide an exception. X-ray Absorbtion Near-Edge Structure (XANES) measurements showed that the manganese exists as Mn+6 in our compound. Six of its seven valence electrons are transfered to the MoS 68 clusters of the compound. As Mn+6 has on1~ one valence electron in the 3-d orbital we expect it to be on1y slight1y magnetic. This helps to explain the low rate of T c depression. T for these compounds is dependent on the number c of electrons available to the mo1ibdenum atoms, and it peaks when this number is optimized. The peak in the T curve is c explained b~ considering the extra electrons transfered to the mo1ibdenum as the manganese doping is increased. H(T) curves upward from 0 to 15 kOe and is linear from c2 15 to 30 kOe. The curvature of the low-field section increases as the manganese doping is raised from x=O.O to x=0.06. Above x=0.06 the curvature does not change. The slope of the linear section does not vary with manganese content.","abstract_has_math":false,"creators":["Miller, William Michael"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Ginsberg, D.M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-06T18:31:38Z","date_published":"2011-06-06T18:31:38Z","updated_at":"2026-07-22T22:25:24Z","subjects":["manganese doping","superconducting transition temperature","upper critical field","tin-molybdenum-sulfide","x-ray powder diffractometry","optical microscopy","electron microscopy","electron microprobe"],"languages":["en"],"rights":["1984 William Michael Miller"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["826557"],"render_values":[{"text":"826557","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25307","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ginsberg, D.M."]},{"key":"dc:creator","label":"Author","values":["Miller, William Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-06T18:31:38Z","10000-01-01","1984"]},{"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":["manganese doping","superconducting transition temperature","upper critical field","tin-molybdenum-sulfide","x-ray powder diffractometry","optical microscopy","electron microscopy","electron microprobe"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1984 William Michael Miller"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["826557","http://hdl.handle.net/2142/25307"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have measured the superconducting transition temperature, Tc' and the upper critical field, Hc2 (T), of manganese-doped SnMo6S8 (MnxSn1_xMo6S8)' These samples had reproducible superconducting properties. They were characterized by x-ray powder diffractometry, optical microscopy. electron microscopy, and electron microprobe work. The transition temperature decreased slow1~ with increasing manganese content until x=O.06. It then increased until x=O.10. after which it fell slow1~ again. Manganese would norma11y have strong pair-breaking effects on the quasipartic1es, but our results provide an exception. X-ray Absorbtion Near-Edge Structure (XANES) measurements showed that the manganese exists as Mn+6 in our compound. Six of its seven valence electrons are transfered to the MoS 68 clusters of the compound. As Mn+6 has on1~ one valence electron in the 3-d orbital we expect it to be on1y slight1y magnetic. This helps to explain the low rate of T c depression. T for these compounds is dependent on the number c of electrons available to the mo1ibdenum atoms, and it peaks when this number is optimized. The peak in the T curve is c explained b~ considering the extra electrons transfered to the mo1ibdenum as the manganese doping is increased. H(T) curves upward from 0 to 15 kOe and is linear from c2 15 to 30 kOe. The curvature of the low-field section increases as the manganese doping is raised from x=O.O to x=0.06. Above x=0.06 the curvature does not change. The slope of the linear section does not vary with manganese content.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5)","Made available in DSpace on 2011-06-06T18:31:38Z (GMT). No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5) Previous issue date: 1984","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:17:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["The effect of manganese doping on the superconducting transition temperature and the upper critical field of tin-molybdenum-sulfide"]}]}],"canonical_facts":{"dc:contributor":["Ginsberg, D.M."],"dc:creator":["Miller, William Michael"],"dc:date":["2011-06-06T18:31:38Z","10000-01-01","1984"],"dc:description":["We have measured the superconducting transition temperature, Tc' and the upper critical field, Hc2 (T), of manganese-doped SnMo6S8 (MnxSn1_xMo6S8)' These samples had reproducible superconducting properties. They were characterized by x-ray powder diffractometry, optical microscopy. electron microscopy, and electron microprobe work. The transition temperature decreased slow1~ with increasing manganese content until x=O.06. It then increased until x=O.10. after which it fell slow1~ again. Manganese would norma11y have strong pair-breaking effects on the quasipartic1es, but our results provide an exception. X-ray Absorbtion Near-Edge Structure (XANES) measurements showed that the manganese exists as Mn+6 in our compound. Six of its seven valence electrons are transfered to the MoS 68 clusters of the compound. As Mn+6 has on1~ one valence electron in the 3-d orbital we expect it to be on1y slight1y magnetic. This helps to explain the low rate of T c depression. T for these compounds is dependent on the number c of electrons available to the mo1ibdenum atoms, and it peaks when this number is optimized. The peak in the T curve is c explained b~ considering the extra electrons transfered to the mo1ibdenum as the manganese doping is increased. H(T) curves upward from 0 to 15 kOe and is linear from c2 15 to 30 kOe. The curvature of the low-field section increases as the manganese doping is raised from x=O.O to x=0.06. Above x=0.06 the curvature does not change. The slope of the linear section does not vary with manganese content.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5)","Made available in DSpace on 2011-06-06T18:31:38Z (GMT). No. of bitstreams: 1 1984_miller.pdf: 3194441 bytes, checksum: c6396e69c916b7f925c4208a81ad442d (MD5) Previous issue date: 1984","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T18:31:38Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:17:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["826557","http://hdl.handle.net/2142/25307"],"dc:language":["en"],"dc:rights":["1984 William Michael Miller"],"dc:subject":["manganese doping","superconducting transition temperature","upper critical field","tin-molybdenum-sulfide","x-ray powder diffractometry","optical microscopy","electron microscopy","electron microprobe"],"dc:title":["The effect of manganese doping on the superconducting transition temperature and the upper critical field of tin-molybdenum-sulfide"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}