Higher anisotropic d-wave symmetry in cuprate superconductors

TL;DR

This paper derives a pair potential based on tight-binding interactions that results in a higher anisotropic d-wave symmetry in cuprate superconductors, explaining their elevated BCS characteristic ratio.

Contribution

It introduces a new pair potential model that produces higher anisotropic d-wave symmetry, aligning with experimental observations in high-temperature superconductors.

Findings

Higher anisotropic d-wave symmetry explains increased BCS ratio

Derived pair potential aligns with spin fluctuation theory

Enhanced anisotropy is key to understanding cuprate superconductivity

Abstract

We derive a pair potential from tight binding further neighbours attraction that leads to superconducting gap symmetry similar to that of the phenomenological spin fluctuation theory of high temperature superconductors (Monthoux, Balatsky, Pines, Phys. Rev. Lett. {\bf 67}, 3448). We show that higher anisotropic d-wave than the simpliest d-wave symmetry is one of the important ingredients responsible for higher BCS characteristic ratio.