Pairing with Spin Fluctuations

Pairing with Spin Fluctuations

Superconductivity requires a “pairing interaction”—an indirect attractive force between the conduction electrons that can overcome their direct Coulomb repulsion. To prove which particular degrees of freedom provide this pairing interaction is supremely difficult: nearly 40 years elapsed between the discovery of superconductivity in 1911 and the “smoking gun” measurement of the isotope effect t...

Title Spin Density Wave Fluctuations and p - Wave Pairing in Sr 2 RuO 4

Fluctuations in spin nematics

Fluctuation effects in nematic-type phases in quantum systems of spin 1 and 9 are examined. The analogue of the Mermin-Wagnertheoremis formulated and the perturbation theory is shown to be logarithmically divergent under certain conditions. The low-energy excitations depend on the parity of 2s.

On spin glass fluctuations

Superconductivity and Spin Fluctuations

The organizers of the Memorial Session for Herman Rietschel asked that I review some of the history of the interplay of superconductivity and spin fluctuations. Initially, Berk and Schrieffer showed how paramagnon spin fluctuations could suppress superconductivity in nearly-ferromagnetic materials. Following this, Rietschel and various co-workers wrote a number of papers in which they investiga...