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We report here the observation of anomalous paramagnetic signal(s) in theisofield field-cooled cool-down magnetization scans (MFCC(T)) recorded for asingle crystal of a low Tc superconductor Ca3Ir4Sn13. Novel features emanatingfrom the MFCC(T) response include an oscillatory magnetization behaviour belowTc and a rich multiplicity (non-uniqueness) in magnetization ranging fromdiamagnetism to paramagnetism at a given H, T value. The metastability inMFCC(T) has been ascribed to non-unique coexistence of multi-quanta vortexstates and single quantum (Abrikosov) vortices. Additionally, the isothermalM(H) scans recorded across a short window of temperature just below Tc showevidence for only the multi-quanta vortex states in the domain of surfacesuperconductivity, with no fingerprint(s) of pinned Abrikosov lattice.

Evidence of surface superconductivity and multi-quanta vortex states in a weakly-pinned single crystal of Ca3Ir4Sn13