K-space magnetism as the origin of superconductivity

TL;DR

This paper proposes that k-space magnetism, a special spin structure in reciprocal space, underlies the nonadiabatic mechanism of superconductivity, offering a new perspective distinct from traditional BCS theory.

Contribution

It introduces the concept of k-space magnetism as the basis for a nonadiabatic superconductivity mechanism in narrow, half-filled bands with specific symmetry.

Findings

K-space magnetism explains the nonadiabatic pairing mechanism.

The new mechanism differs from and complements BCS theory.

A vivid depiction of the superconductivity process is provided.

Abstract

The nonadiabatic Heisenberg model presents a nonadiabatic mechanism generating Cooper pairs in narrow, roughly half-filled "superconducting bands" of special symmetry. Here we show that this mechanism may be understood as the outcome of a special spin structure in the reciprocal space, hereinafter referred to as k-space magnetism. The presented picture permits a vivid depiction of this new mechanism highlighting the height similarity as well as the essential difference between the new nonadiabatic and the familiar Bardeen-Cooper-Schrieffer mechanism.