Strong magnetic field enhancement of spin triplet pairing arising from coexisting $2k_F$ spin and $2k_F$ charge fluctuations

TL;DR

This paper demonstrates that magnetic fields can significantly enhance spin triplet pairing mediated by coexisting $2k_F$ spin and charge fluctuations, potentially explaining experimental observations in certain organic superconductors.

Contribution

It reveals that magnetic fields can greatly amplify triplet pairing driven by coexisting $2k_F$ fluctuations, a novel insight into pairing mechanisms under magnetic influence.

Findings

Magnetic field enhances triplet pairing more than ferromagnetic spin fluctuations.

Possible explanation for singlet to triplet transition in (TMTSF)$_2$ClO$_4$.

Triplet pairing enhancement is linked to coexisting $2k_F$ fluctuations.

Abstract

We study the effect of the magnetic field (Zeeman splitting) on the triplet pairing. We show generally that the enhancement of spin triplet pairing mediated by coexisting $2k_F$ spin and $2k_F$ charge fluctuations can be much larger than in the case of triplet pairing mediated by ferromagnetic spin fluctuations. We propose that this may be related to the recent experiment for (TMTSF)$_2$ClO$_4$, in which a possibility of singlet to triplet pairing transition has been suggested.