Hidden nesting as origin of strong electron-phonon-coupling
The interplay of complex electronic band structures and the coupling between electrons and the ionic lattice, i.e. electron-phonon-coupling (EPC), is key to an understanding of many unusual electronic band and phonon dispersions as observed, e.g., in cuprates, conventional superconductors but also magnetic metallic materials. However, recent work has shown that assuming a dominant role of the Fermi surface geometry, e.g., due to a strong nesting, is often premature. Here, we propose to perform an in-depth study of EPC as observed by measuring the phonons line width in order to determine the role of electronic band structure and EPC matrix elements. The material of choice is the strong-coupling superconductor YNi2B2C. We will investigate EPC in a volume of momentum space using the FlatCone analyzer-detector setup centered on wave vectors featuring phonons with the strongest EPC effects. We will compare our results to ab-initio lattice dynamical calculations for the phonon line width and the experimentally obtained 3D electronic band structure to determine independently the momentum-dependences of possible nesting geometries and EPC matrix elements.
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WEBER Frank; IVANOV Alexandre; KURZHALS Philipp and REZNIK Dimitry. (2018). Hidden nesting as origin of strong electron-phonon-coupling. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-460
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