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• W2103289929 abstract "We report the observation of positive magnetization on field cooling (PMFC) in low applied magnetic fields (H < 100 Oe) in a single crystal of Ca(3)Rh(4)Sn(13) near its superconducting transition temperature (T(c) approx 8.35 K). For 30 Oe < H < 100 Oe, the PMFC response crosses over to a diamagnetic response as the temperature is lowered below 8 K. For 100 Oe < H < 300 Oe, the diamagnetic response undergoes an unexpected reversal in its field dependence above a characteristic temperature (designated as T*(VL) = 7.9 K), where the field-cooled cool-down magnetization curves intersect. The in-phase and out-of-phase ac susceptibility data confirm the change in the superconducting state across T*(VL). We ascribe the PMFC response to a compression of magnetic flux caused by the nucleation of superconductivity at the surface of the sample. In very low fields (H < 20 Oe), the PMFC response has an interesting oscillatory behaviour which persists up to about 7 K. The oscillatory nature underlines the interplay between competing responses contributing to the magnetization signal in PMFC regime. We believe that the (i) counterintuitive field dependence of the diamagnetic response for H > 100 Oe and above T*(VL) (lasting up to T(c), (ii) the oscillatory character in PMFC response at low fields and (iii) the PMFC peaks near 8.2 K in 30 Oe <= H <= 100 Oe provide support in favour of a theoretical scenario based on the Ginzburg-Landau equations. The scenario predicts the possibility of complex magnetic fluctuations associated with transformation between different metastable giant vortex states prior to transforming into the conventional vortex state as the sample is cooled below T*(VL)." @default.
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• W2103289929 date "2011-07-14" @default.
• W2103289929 modified "2023-10-16" @default.
• W2103289929 title "Crossover from paramagnetic compressed flux regime to diamagnetic pinned vortex lattice in a single crystal of cubic Ca3Rh4Sn13" @default.
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• W2103289929 doi "https://doi.org/10.1103/physrevb.84.014501" @default.
• W2103289929 hasPublicationYear "2011" @default.
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