Inelastic neutron scattering studies of magnetic fluctuations in the tetragonal and collapsed tetragonal phases of CaFe<sub>2</sub>As<sub>2</sub>
dc.contributor.advisor | Alan I. Goldman | |
dc.contributor.author | Soh, Jing Han | |
dc.contributor.department | Department of Physics and Astronomy | |
dc.date | 2018-08-11T15:19:30.000 | |
dc.date.accessioned | 2020-06-30T02:50:48Z | |
dc.date.available | 2020-06-30T02:50:48Z | |
dc.date.copyright | Tue Jan 01 00:00:00 UTC 2013 | |
dc.date.embargo | 2015-07-30 | |
dc.date.issued | 2013-01-01 | |
dc.description.abstract | <p>The relationship between magnetism and superconductivity has become a central topic of research in studies of superconductivity in the iron pnictides. This thesis presents inelastic neutron scattering studies of the magnetic excitations in FeAs flux-grown CaFe<sub>2</sub>As<sub>2</sub>. The ex- perimental data collected using ARCS time-of-flight chopper spectrometer have been analyzed and compared with theoretical models. The focus here is on the role played by antiferromag- netic (AFM) spin fluctuations in superconductivity. We present unambiguous evidence of the absence of magnetic fluctuations in the non-superconducting volume collapsed tetragonal (cT) phase of CaFe<sub>2</sub>As<sub>2</sub> via inelastic neutron scattering time-of-flight data, which is consistent with the view that spin fluctuations are a necessary ingredient for unconventional superconductivity in the iron pnictides. We demonstrate that the cT phase of CaFe<sub>2</sub>As<sub>2</sub> is non-magnetic, raising new questions regarding recent reports of high-temperature superconductivity in the cT phase of closely related compounds.</p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/etd/13593/ | |
dc.identifier.articleid | 4600 | |
dc.identifier.contextkey | 5050434 | |
dc.identifier.doi | https://doi.org/10.31274/etd-180810-3321 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | etd/13593 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/27780 | |
dc.language.iso | en | |
dc.source.bitstream | archive/lib.dr.iastate.edu/etd/13593/Soh_iastate_0097M_13971.pdf|||Fri Jan 14 19:56:11 UTC 2022 | |
dc.subject.disciplines | Condensed Matter Physics | |
dc.subject.disciplines | Physics | |
dc.subject.keywords | 122 | |
dc.subject.keywords | iron-arsenide | |
dc.subject.keywords | neutron scattering | |
dc.subject.keywords | single-crystal | |
dc.subject.keywords | superconductor | |
dc.subject.keywords | time-of-flight | |
dc.title | Inelastic neutron scattering studies of magnetic fluctuations in the tetragonal and collapsed tetragonal phases of CaFe<sub>2</sub>As<sub>2</sub> | |
dc.type | thesis | |
dc.type.genre | thesis | |
dspace.entity.type | Publication | |
relation.isOrgUnitOfPublication | 4a05cd4d-8749-4cff-96b1-32eca381d930 | |
thesis.degree.level | thesis | |
thesis.degree.name | Master of Science |
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