Upper critical field Hc2 in Bechgaard salts (TMTSF)2PF6
Ana D Folgueras, Kazumi Maki
TL;DR
This paper investigates the superconducting symmetry in Bechgaard salts, using a low energy Hamiltonian to analyze the temperature dependence of the upper critical field, suggesting a chiral f-wave pairing as the most probable state.
Contribution
It introduces a theoretical model to analyze Hc2(T) in (TMTSF)2PF6, proposing chiral f-wave pairing as the likely superconducting symmetry.
Findings
Hc2 ~ 5 Tesla at T=0K supports triplet pairing
Analysis indicates chiral f-wave as the most probable pairing symmetry
The model explains the temperature dependence of Hc2(T)
Abstract
The symmetry of the superconductivity in Bechgaard salts is still unknown, though the triplet pairing has been established by Hc2 and NMR for (TMTSF)2PF6. The large upper critical field at T = 0K (Hc2 ~ 5 Tesla) both for H || a and H || b also indicates strongly the triplet pairing. Here we start with a low energy effective Hamiltonian and study the temperature dependence of the corresponding Hc2(T)'s. The present analysis suggests that one chiral f-wave superconductor should be the most likely candidate near the upper critical field.
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