Abstract
Nature of the pairing and vortex states are studied in Sr 2RuO 4 using a Hall probe array. No clear evidence for the spontaneous magnetic field, accompanying the time-reversal symmetry breaking states, has been obtained. Magnetization with H a∥ c shows an anomaly close to H c2 and a peak near H a=0. We interpret the former to be due to the synchronization peak effect. H c1 or change in the vortex lattice structure could be relevant to the latter.
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