Tazai Theory of Multipole Fluctuation Mediated Superconductivity and Multipole Phase

Important Roles of Many Body Effects and Strong Spin-Orbit Coupling
1. Auflage 2021
ISBN: 978-981-16-1026-4
Verlag: Springer Singapore
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 118 Seiten, eBook

Reihe: Springer Theses

A strong spin-orbit interaction and Coulomb repulsion featuring strongly correlated d - and f -electron systems lead to various exotic phase transition including unconventional superconductivity and magnetic multipole order. However, their microscopic origins are long standing problem since they could not be explained based on conventional Migdal-Eliashberg theorem. The book focuses on many-body correlation effects beyond conventional theory for the  d - and f -electron systems, and theoretically demonstrates the correlations to play significant roles in “mode-coupling” among multiple quantum fluctuations, which is called  U - VC here. The following key findings are described in-depth: (i) spin triplet superconductivity caused by  U - VC , (ii) being more important  U - VC in f -electron systems due to magnetic multipole degrees of freedom induced by a spin-orbit interaction, and (iii)  s -wave superconductivity stabilized cooperatively by antiferromagnetic fluctuations and electron-phonon interaction contrary to conventional understanding. The book provides meaningful step for revealing essential roles of many-body e?ects behind long standing problems in strongly correlated materials.

Zielgruppe

Research

Autoren/Hrsg.

Tazai, Rina

Inhaltsverzeichnis

General Introduction.- Functional Renormalization Group (fRG) study.- Cooperation of el-ph and AFM fluctuations for SC state.- S-wave superconductivity in CeCu2Si2.- Multipole phase.