Study of the noise in the magnetization data across the second magnetization peak and peak effect region in Ca3Rh4Sn13

• We observe second magnetization peak (SMP) and peak effect (PE) in Ca3Rh4Sn13.
• First measurement of noise in magnetization data across the SMP and the PE regions.
• 1/f Nature of the noise is observed deep inside the Bragg glass phase.
• One low resonant frequency is observed across the SMP region.
• Two sets of resonant frequencies are observed in the PE region.

In this report we make an attempt to understand the spectral fluctuations in noise in magnetization data for a single crystal of Ca3Rh4Sn13, which exhibit both the phenomena of second magnetization peak (SMP) and peak effect (PE). We find the signatures of 1/f1.8 noise deep inside the mixed phase of this superconductor. Further across the SMP region a single resonance frequency appears in the power spectra and it persists till the superconducting to normal phase boundary. While crossing the PE anomaly another set of resonance peaks in the low frequency range emerges which is distinctly different from the one which appeared in the SMP, indicating the underlying difference in the origin and nature of the SMP and PE phenomenon.