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We report the observation of positive magnetization on field cooling (PMFC)in low applied magnetic fields (H < 100 Oe) in a single crystal ofCa(3)Rh(4)Sn(13) near its superconducting transition temperature (T(c) approx8.35 K). For 30 Oe < H < 100 Oe, the PMFC response crosses over to adiamagnetic response as the temperature is lowered below 8 K. For 100 Oe < H <300 Oe, the diamagnetic response undergoes an unexpected reversal in its fielddependence above a characteristic temperature (designated as T*(VL) = 7.9 K),where the field-cooled cool-down magnetization curves intersect. The in-phaseand out-of-phase ac susceptibility data confirm the change in thesuperconducting state across T*(VL). We ascribe the PMFC response to acompression of magnetic flux caused by the nucleation of superconductivity atthe surface of the sample. In very low fields (H < 20 Oe), the PMFC responsehas an interesting oscillatory behaviour which persists up to about 7 K. Theoscillatory nature underlines the interplay between competing responsescontributing to the magnetization signal in PMFC regime. We believe that the(i) counterintuitive field dependence of the diamagnetic response for H > 100Oe and above T*(VL) (lasting up to T(c), (ii) the oscillatory character in PMFCresponse at low fields and (iii) the PMFC peaks near 8.2 K in 30 Oe <= H <= 100Oe provide support in favour of a theoretical scenario based on theGinzburg-Landau equations. The scenario predicts the possibility of complexmagnetic fluctuations associated with transformation between differentmetastable giant vortex states prior to transforming into the conventionalvortex state as the sample is cooled below T*(VL).

Crossover from paramagnetic compressed flux regime to diamagnetic pinned vortex lattice in a single crystal of cubic Ca(3)Rh(4)Sn(13)