Pairing and vortex states in Sr₂RuO₄ studied by Hall probe magnetometry

Nature of the pairing and vortex states are studied in Sr2RuO4 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 Ha∥c shows an anomaly close to Hc2 and a peak near Ha = 0. We interpret the former to be due to the synchronization peak effect. Hc1 or change in the vortex lattice structure could be relevant to the latter. © 2000 Elsevier Science B.V. All rights reserved.