Abstract
Contrary to the starting assumption of Grbić et al. [Phys. Rev. B 83, 144508 (2011)], here we will argue that a 16-T magnetic field is not enough to quench all superconducting fluctuations above in . We conclude that through their measurements of microwave absorption these authors actually determine the AC fluctuation magnetoconductivity at 16 T, instead of the zero-field AC paraconductivity as they contend. So the temperature proposed by Grbić et al. for the onset of the superconducting fluctuations, , will correspond to the one at which the finite-field effects at 16 T become measurable in their experiments and the actual fluctuation onset will be located well above . These conclusions, which also concern influential recent publications on that issue, are confirmed by analyzing some of the Grbić et al. data on the grounds of the Gaussian Ginzburg-Landau approach for the finite-field (or Prange) fluctuation regime.
- Received 19 October 2019
- Revised 26 March 2020
- Accepted 22 October 2020
DOI:https://doi.org/10.1103/PhysRevB.102.176501
©2020 American Physical Society