{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:62050"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:62050","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Magnon heat transport and magnon-hole scattering in one and two dimensions spin systems","abstract":"The magnon thermal conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 already slight hole doping (~1 %) almost completely suppresses k_mag. Comparison with k_mag of Zn-doped La2CuO4 reveals that magnon-hole scattering is even stronger than cattering on static magnetic defects. In (Sr,Ca)14Cu24O41 a strong doping and temperature dependence of k_mag is present at low Ca-doping levels ( x £ 5). Here a unique relation between heat transport and charge ordering in the ladder subunits of the material has been shown. In the charge ordered state at low temperatures magnon-hole scattering is completely unimportant, while it becomes strong at high temperatures where in strength it is comparable with scattering of magnons on static magnetic defects induced by Zn-doping. At high Ca-doping (x ³ 5) the doping dependence of k_mag is only weak. However, an anisotropic suppression of the phononic thermal conductivity at low temperatures indicates a new doping-induced one dimensional scattering process of phonons.","abstract_html":"The magnon thermal conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 already slight hole doping (~1 %) almost completely suppresses k_mag. Comparison with k_mag of Zn-doped La2CuO4 reveals that magnon-hole scattering is even stronger than cattering on static magnetic defects. In (Sr,Ca)14Cu24O41 a strong doping and temperature dependence of k_mag is present at low Ca-doping levels ( x £ 5). Here a unique relation between heat transport and charge ordering in the ladder subunits of the material has been shown. In the charge ordered state at low temperatures magnon-hole scattering is completely unimportant, while it becomes strong at high temperatures where in strength it is comparable with scattering of magnons on static magnetic defects induced by Zn-doping. At high Ca-doping (x ³ 5) the doping dependence of k_mag is only weak. However, an anisotropic suppression of the phononic thermal conductivity at low temperatures indicates a new doping-induced one dimensional scattering process of phonons.","abstract_has_math":false,"creators":["Haes, Hanan Gouda Abd Elwahab Ahmed el"],"institution":"Publikationsserver der RWTH Aachen University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Büchner, Bernd Kurt"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2004,"date_issued":"2004","date_published":"2004","updated_at":"2026-07-30T19:43:19Z","subjects":["info:eu-repo/classification/ddc/530","Cuprate","Quantenspinsystem","Niederdimensionales System","Wärmeleitfähigkeit","Magnon","Physik"],"languages":["eng"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123648%22"],"render_values":[{"text":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123648%22","href":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123648%22","code":true}]}]},"links":{"outbound_url":"https://publications.rwth-aachen.de/record/62050","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Büchner, Bernd Kurt"]},{"key":"dc:creator","label":"Author","values":["Haes, Hanan Gouda Abd Elwahab Ahmed el"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:coverage","label":"Dc Coverage","values":["DE"]},{"key":"dc:date","label":"Dc Date","values":["2004"]},{"key":"dc:publisher","label":"Institution","values":["Publikationsserver der RWTH Aachen University"]},{"key":"dc:relation","label":"Dc Relation","values":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-9278","info:eu-repo/semantics/altIdentifier/doi/10.18154/RWTH-CONV-123648"]},{"key":"dc:type","label":"Dc Type","values":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["info:eu-repo/classification/ddc/530","Cuprate","Quantenspinsystem","Niederdimensionales System","Wärmeleitfähigkeit","Magnon","Physik"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/record/62050","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123648%22"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The magnon thermal conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 already slight hole doping (~1 %) almost completely suppresses k_mag. Comparison with k_mag of Zn-doped La2CuO4 reveals that magnon-hole scattering is even stronger than cattering on static magnetic defects. In (Sr,Ca)14Cu24O41 a strong doping and temperature dependence of k_mag is present at low Ca-doping levels ( x £ 5). Here a unique relation between heat transport and charge ordering in the ladder subunits of the material has been shown. In the charge ordered state at low temperatures magnon-hole scattering is completely unimportant, while it becomes strong at high temperatures where in strength it is comparable with scattering of magnons on static magnetic defects induced by Zn-doping. At high Ca-doping (x ³ 5) the doping dependence of k_mag is only weak. However, an anisotropic suppression of the phononic thermal conductivity at low temperatures indicates a new doping-induced one dimensional scattering process of phonons."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University II, 89, [6] S. : graph. Darst. (2004). doi:10.18154/RWTH-CONV-123648 = Aachen, Techn. Hochsch., Diss., 2004"]},{"key":"dc:title","label":"Title","values":["Magnon heat transport and magnon-hole scattering in one and two dimensions spin systems"]}]}],"canonical_facts":{"dc:contributor":["Büchner, Bernd Kurt"],"dc:coverage":["DE"],"dc:creator":["Haes, Hanan Gouda Abd Elwahab Ahmed el"],"dc:date":["2004"],"dc:description":["The magnon thermal conductivity k_mag of the low dimensional quantum spin systems La2CuO4 and (Sr,Ca)14Cu24O41 with a focus on magnon hole scattering and its relevance for the magnetic heat transport has been investigated experimentally. In the two dimensional Heisenberg antiferromagnet La2CuO4 already slight hole doping (~1 %) almost completely suppresses k_mag. Comparison with k_mag of Zn-doped La2CuO4 reveals that magnon-hole scattering is even stronger than cattering on static magnetic defects. In (Sr,Ca)14Cu24O41 a strong doping and temperature dependence of k_mag is present at low Ca-doping levels ( x £ 5). Here a unique relation between heat transport and charge ordering in the ladder subunits of the material has been shown. In the charge ordered state at low temperatures magnon-hole scattering is completely unimportant, while it becomes strong at high temperatures where in strength it is comparable with scattering of magnons on static magnetic defects induced by Zn-doping. At high Ca-doping (x ³ 5) the doping dependence of k_mag is only weak. However, an anisotropic suppression of the phononic thermal conductivity at low temperatures indicates a new doping-induced one dimensional scattering process of phonons."],"dc:identifier":["https://publications.rwth-aachen.de/record/62050","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123648%22"],"dc:language":["eng"],"dc:publisher":["Publikationsserver der RWTH Aachen University"],"dc:relation":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-9278","info:eu-repo/semantics/altIdentifier/doi/10.18154/RWTH-CONV-123648"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:source":["Aachen : Publikationsserver der RWTH Aachen University II, 89, [6] S. : graph. Darst. (2004). doi:10.18154/RWTH-CONV-123648 = Aachen, Techn. 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