Abstract
We have performed magneto-optical measurements on a series of $\mathrm{high}\text{\ensuremath{-}}{T}_{c}$ superconductors with magnetic field up to $18\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Similar to previous reports in smaller fields, the results reveal that the optical constants, both in the normal and superconducting state, of several families of $\mathrm{high}\text{\ensuremath{-}}{T}_{c}$ cuprates are completely insensitive to the application of external magnetic field. These magneto-optical results seem to indicate that either the bosonic mode responsible for pairing is not magnetic in origin, or the charge carriers are not very strongly coupled to it. We discuss the results within the existing theoretical models.
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