Electron-Phonon Interaction in Conventional and Unconventional Superconductors [electronic resource] /by Pegor Aynajian.
by Aynajian, Pegor [author.]; SpringerLink (Online service).
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BookSeries: Springer Theses: Publisher: Berlin, Heidelberg : Springer Berlin Heidelberg, 2011.Description: XII, 101 p. online resource.ISBN: 9783642149689.Subject(s): Physics | Physics | Strongly Correlated Systems, Superconductivity | Low Temperature Physics | Spectroscopy and MicroscopyDDC classification: 530.41 Online resources: Click here to access online | Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
| MAIN LIBRARY | QC611.9-611.98 (Browse shelf) | Available |
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| TP248.13-248.65 Nano/Micro Biotechnology | Q334-342 Coordination, Organizations, Institutions and Norms in Agent Systems V | HF1351-1647 Innovation, Growth and Competitiveness | QC611.9-611.98 Electron-Phonon Interaction in Conventional and Unconventional Superconductors | K7000-7720.22 Non-State Regulatory Regimes | Q334-342 Computational Logic in Multi-Agent Systems | Q334-342 Structural, Syntactic, and Statistical Pattern Recognition |
1. Introduction -- 2. Phonons and their Interactions -- 3. Conventional Superconductivity -- 4. Unconvential Superconductivity -- 5. Neutron Spectroscopy -- 6. Experimental Aspects -- 7. Results and Discussions -- 8. Conclusion.
The problem of conventional, low-temperature superconductivity has been regarded as solved since the seminal work of Bardeen, Cooper, and Schrieffer (BCS) more than 50 years ago. However, the theory does not allow accurate predictions of some of the most fundamental properties of a superconductor, including the superconducting energy gap on the Fermi surface. This thesis describes the development and scientific implementation of a new experimental method that puts this old problem into an entirely new light. The nominee has made major contributions to the development and implementation of a new experimental method that enhances the resolution of spectroscopic experiments on dispersive lattice-vibrational excitations (the "glue" responsible for Cooper pairing of electrons in conventional superconductors) by more than two orders of magnitude. Using this method,he has discovered an unexpected relationship between the superconducting energy gap and the geometry of the Fermi surface in the normal state, both of which leave subtle imprints in the lattice vibrations that could not be resolved by conventional spectroscopic methods. He has confirmed this relationship on two elemental superconductors and on a series of metallic alloys. This indicates that a mechanism qualitatively beyond the standard BCS theory determines the magnitude and anisotropy of the superconducting gap.
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