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Theory of multipole fluctuation mediated superconductivity and multipole phase : important roles of many body effects and strong spin-orbit coupling / Rina Tazai.

9789811610264 (electronic bk.)
9811610266 (electronic bk.)
9789811610257
9811610258

Singapore : Springer, [2021]

English

1 online resource (128 pages)

10.1007/978-981-16-1026-4 doi

QC611.92

537.6/23

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 eects behind long standing problems in strongly correlated materials.

"Doctoral thesis accepted by Nagoya University, Nagoya, Japan."

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