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Reference: Isabel Franke, (2011). Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields. DPhil. University of Oxford.Citable link to this page:

 

Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields

Abstract: This thesis presents the investigation of magnetism in a selection of low-dimensionalsystems and its relation to other physical properties, such as superconductivity. Thetechniques employed are muon spin rotation and pulsed magnetic field magnetisation.The ability of muons to directly probe the local field is used to study SrFeAsF, which isa parent compound of the high-temperature superconducting pnictides. This revealedthat the magnetic and structural transitions are separated in this system. I then demon-strate the coexistence of magnetism and superconductivity in NaFeAs for the first time.This discovery is of great interest since the interplay between magnetism and supercon-ductivity is thought to play an important role for high-temperature superconductivity.I further investigate the effect of partially replacing Fe with Co in NaFeAs. I study theordering and spin reorientation in the Mott insulator Sr₂IrO₄, which has been suggestedas a possible high-temperature superconductor. The complex magnetism observed inthis system is contrasted to that in related iridates Ca₄IrO₆, Ca₅Ir₃O₁₂ and Sr₃Ir₂O₇.By combining pulsed-field magnetization and low magnetic field experiments with μSRon a series of coordination polymers. I am able to determine the size and direction ofthe magnetic exchange interaction. I demonstrate how it is possible to adjust the in-teractions by altering the molecular architecture of these Cu-based spin- 12 compounds.This is a significant contribution since it will lead to the targeted design of magneticsystems that can be utilized to experimentally test fundamental theories of magnetism.

Digital Origin:Born digital Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford

Contributors

Prof Stephen BlundellMore by this contributor

RoleSupervisor

 Bibliographic Details

Issue Date: 2011

Copyright Date: 2012 Identifiers

Urn: uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 Item Description

Type: thesis;

Language: en Keywords: magnetism superconductivity muon spin rotation high magnetic fields coordination polymers transition metal oxides quasi-low-dimensional systemsSubjects: Condensed Matter Physics Co-ordination chemistry Tiny URL: ora:6221

Relationships





Autor: Isabel Franke - institutionUniversity of Oxford facultyMathematical,Physical and Life Sciences Division - Physics - Condensed Mat

Fuente: https://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1



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