Comment On 'spatial Line Nodes And Fractional Vortex Pairs In The Fulde-ferrell-larkin-ovchinnikov Vortex State Of Spin-singlet Superconductors'

摘要

Recent observations [1,2] of a high field superconducting (SC) phase in CeCoIn_5 have led to intense interest [3,4] in modulated vortex phases induced by the paramagnetic depairing. The authors of Ref. [5] have discussed a possibility that, as a candidate of the high field state in CeCoIn_5, a crisscrossing lattice of integer vortices with a fractional magnetic flux replaces the so-called LO vortex lattice [4,6] with periodic nodal planes perpendicular to the field H and have argued that thermal conductivity κ's data [7] are consistent with the former state rather than the latter. Below, it is pointed out that available experimental facts in CeCoIn_5 are incompatible with properties peculiar to the former state and that the analysis in Ref. [5] is lacking in a firm theoretical basis.