Raman Spectra of Triplet Superconductor in Sr$_2$RuO$_4$

TL;DR

This paper analyzes the Raman spectra of Sr$_2$RuO$_4$ superconductors, identifying characteristic clapping modes for p-wave and f-wave symmetries as prominent resonances in Raman spectra.

Contribution

It provides the first detailed theoretical prediction of clapping modes in Raman spectra for triplet superconductors with specific symmetries in Sr$_2$RuO$_4$.

Findings

Clapping mode at $ extstylerac{ ext{sqrt}(2)}{ ext{Delta}(T)}$ for p-wave

Clapping mode at $1.02 ext{Delta}(T)$ for f-wave

Resonance features in B1g and B2g Raman spectra

Abstract

We study the Raman spectra of spin-triplet superconductors in Sr$_2$RuO$_4$. The p-wave and f-wave symmetries are considered. We show that there is the clapping mode with frequency of $\sqrt{2} \Delta(T)$ and $1.02 \Delta(T)$ for p-wave and f-wave superconductors, respectively. This mode is visible as a huge resonance in the B1g and B2g modes of Raman spectra. We discuss the details of the Raman spectra in these superconducting states.