Measurement of Fluctuation-induced Diamagnetism in BSCCO-2212 single crystals using Magneto-optics

TL;DR

This study investigates fluctuation-induced diamagnetism in BSCCO-2212 single crystals across various doping levels using magneto-optics, revealing frequency-dependent shifts in superconducting transition temperature linked to phase fluctuations.

Contribution

It provides the first magneto-optic measurement of fluctuation diamagnetism in BSCCO-2212 across a wide frequency range, highlighting the role of phase fluctuations.

Findings

Frequency-dependent shift in Tc onset up to 6 K

Observation of phase fluctuation effects in underdoped samples

Magneto-optic technique effectively probes fluctuation phenomena

Abstract

Fluctuation induced diamagnetism in BSCCO single crystals with different doping levels (i.e., different oxygen stoichiometry) was measured using magneto-optics (MO) in a wide frequency range up to several MHz. A shift in Tc onset, measured by MO, of up to 6 K towards higher temperatures was observed at high frequencies in those samples which are far from the optimally doped condition. An explanation of the observed effect in terms of the phase fluctuations of the superconducting order parameter is proposed.