Investigation of the Vortex States of Sr₂RuO₄-Ru Eutectic Microplates Using DC-SQUIDs

Time-reversal invariant superconductivity of Sr2RuO4 revealed by Josephson effects

“…Although the chiral superconductivity of Sr 2 RuO 4 has been widely accepted, the helical state is also consistent with many other experiments carried out in recent years. The formation of the topological edge state reproducibly detected by the quasiparticle tunneling effect [11][12][13] and the absence of the edge current observed by a variety of real space magnetic field probes [19][20][21]50] are naturally explained by the helical states. The appearance of the half-integer flux quanta [52,53] is a consequence of the equal-spin pairing states of Sr 2 RuO 4 , and thus it is compatible with both the helical and chiral states.…”

“…Hall element [21], and a micro-SQUID [50]. Although several theories have explored the compatibility of the chiral superconductivity with a lack of spontaneous edge current [22][23][24][25][26][27][28], the inconsistency has not been resolved yet.…”