Unconventional magnetic order and excitations in the pseudogap phase of mercury barium copper oxide
Abstract/Contents
- Abstract
- A major open issue about the cuprate high-temperature superconductors is the nature of the pseudogap phenomenon. In this Thesis, I report results of neutron scattering studies on the model hole-doped compound HgBa2CuO4+d (Hg1201). I first report polarized neutron diffraction results, which show evidence in Hg1201 for a novel "hidden" magnetic order in the pseudogap phase that preserves the translational invariance of the crystal lattice, and a lack of evidence for any additional order that would break this invariance. The observations are consistent with either unconventional spin order or magnetic order due to orbital charge currents. I then present a systematic study of the high-energy magnetic excitations in Hg1201 using inelastic neutron scattering. The investigation started with measurements of the magnetic "resonance" mode, and then unexpectedly led to the discovery of novel magnetic excitations that have not been previously identified in the cuprates. These excitations seem to be associated with the hidden magnetic order in the pseudogap phase, and they have highly unusual characteristics that go outside of the conventional wisdom for the cuprates. Finally, I present results for Hg1201 from two other experimental techniques: magnetometry for uniform susceptibility and X-ray photoelectron spectroscopy. The main conclusion of this Thesis is that there exist significant magnetic correlations that are fundamentally different from the well-studied antiferromagnetic correlations. The novel magnetism seems to involve hole carriers that reside not only in the copper-oxygen layers, but also in other orbitals that likely involve the apical oxygens.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2010 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Li, Yuan |
|---|---|
| Associated with | Stanford University, Department of Physics |
| Primary advisor | Greven, Martin |
| Primary advisor | Kapitulnik, Aharon |
| Thesis advisor | Greven, Martin |
| Thesis advisor | Kapitulnik, Aharon |
| Thesis advisor | Shen, Zhi-Xun |
| Advisor | Shen, Zhi-Xun |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Yuan Li. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2010. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2010 by Yuan Li
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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