Abstract
We report on the measurement of the magnetization of mesoscopic plates made of the chiral p-wave superconductor Sr2RuO4 by using micro-dc-superconducting quantum interference devices (SQUIDs) positioned immediately below the plates. The high sensitivity of the micro-dc-SQUIDs is expected to enable the detection of direction of the chirality. We measured the magnetization of mesoscopic Sr2RuO4 plate-like crystals and found residual magnetization at the zero external field in the thin sample and detected a first critical field Hc1 symmetric against the magnetic field direction. The observed symmetric first critical field Hc1 is consistent with the formation of multi-chiral domain structures. We carefully discuss the origin of the residual magnetization and conclude that it is due to the remnant vortices rather than the chiral edge current.
Published Version
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