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DC Field | Value | Language |
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dc.contributor.advisor | Gaulin, Bruce D. | - |
dc.contributor.author | Wagman, Jerod Justin | - |
dc.date.accessioned | 2015-09-24T19:07:36Z | - |
dc.date.available | 2015-09-24T19:07:36Z | - |
dc.date.issued | 2015-11 | - |
dc.identifier.uri | http://hdl.handle.net/11375/18173 | - |
dc.description.abstract | A series of neutron scattering studies of unconventional superconductors is presented. These measurements are split into two parts. The first part considers the purely magnetic scattering in low-doped $La_{2−x}Ba_{x}CuO_{4}$. This study is comprehensive and elucidates much of the doping and temperature dependence of the low energy magnetic scattering in this system. It also clearly demonstrates that two dimensional incommensurate magnetic order in this system forms at the expense of three dimensional commensurate magnetic order. The remainder of the thesis is concerned with characterizing and determining the physics underlying pronounced enhancements of the inelastic scattering found to exist at 20 meV at equivalent two dimensional magnetic zone centers in both $La_{2−x}Ba_{x}CuO_{4}$ and $La_{2−x}Sr_{x}CuO_{4}$. Arguments are presented to interpret these features as a result spin-phonon hybridization in 214 cuprate superconductors. The measurements also explore the temperature and doping dependence of these features, determining that the enhancements are largely insensitive to doping and only present parametric response at temperatures relevant for three dimensional magnetic order in this system. In addition, the first evidence for a superconducting spin gap in $La_{2−x}Ba_{x}CuO_{4}$ is presented. The implications of these findings are discussed. | en_US |
dc.language.iso | en | en_US |
dc.subject | Superconductivity | en_US |
dc.subject | Magnetism | en_US |
dc.subject | Neutron Scattering | en_US |
dc.subject | Dynamics | en_US |
dc.subject | Hybridization | en_US |
dc.subject | Resonance | en_US |
dc.subject | Spin Gap | en_US |
dc.subject | Cuprates | en_US |
dc.title | NEUTRON SCATTERING STUDIES OF STRONG DYNAMIC CORRELATIONS IN UNCONVENTIONAL SUPERCONDUCTORS: LOOKING THROUGH THE HOUR-GLASS TO HYBRIDIZATION AND A SUPERCONDUCTING SPIN RESONANCE | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | Physics and Astronomy | en_US |
dc.description.degreetype | Thesis | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
dc.description.layabstract | This thesis discusses a series of measurements using brand new state of the art facilities to re-examine the family of high temperature superconductors with the simplest structure. By taking advantage of these new facilities and applying their capabilities to a, relatively speaking, simpler material family, the goal is to try and learn more about what may be the cause of high temperature superconductivity - a magnetism based phenomenon with profound implications for energy efficiency, energy storage, diagnostic healthcare, quantum computing and much more. While many interesting effects were observed, two of the more important findings were observations that unify the physical descriptions of $La_{2−x}Ba_{x}CuO_{4}$ and $La_{2−x}Sr_{x}CuO_{4}$, as is necessary to have a truly universal understanding of high temperature superconductivity, and a detailed characterization we interpret as hybridization. It is clear from this work that any complete solution of superconductivity must also explain this part magnetic and part crystalline structural hybridization phenomenon. | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Wagman_Jerod_J_2015_Sept_PhD.pdf | Two introductory chapters, followed by three article style chapters and a conclusion. The first two article style chapters were published at the time of submission of this thesis and the third will be submitted to Physical Review B in the next couple of business days. | 11.64 MB | Adobe PDF | View/Open |
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