  The era of near-room-temperature superconductivity started after experimental
discovery by Drozdov et al (2015 Nature 525 73) who found that compressed H3S
exhibits superconducting transition at Tc = 203 K. To date, the record
near-room-temperature superconductivity stands with another hydrogen-rich
highly compressed compound, LaH10 (Somayazulu et al 2019 Phys. Rev. Lett. 122
027001), which has critical temperature of Tc>240 K. In this paper, we analyse
available upper critical field, Bc2(T), data for LaH10 (Drozdov et al 2019
Nature 569 528) and report that this compound in all considered scenarios has
the ratio of Tc to the Fermi temperature, Tf, 0.009 < Tc/Tf < 0.038, which is
typical range for unconventional superconductors. In attempt to extend our
finding, we examined experimental Bc2(T) data for superconductors in the
palladium-hydrogen (PdHx) and thorium-hydrogen-deiterium (ThH-ThD) systems and
surprisingly find that superconductors in both these systems also fall into
unconventional superconductors band. Taking in account that H3S has the ratio
of 0.012 < Tc/Tf < 0.039 (Talantsev 2019 Mod. Phys. Lett. B 33 1950195) we come
to conclusion that in the Uemura plot all discovered to date hydrogen-rich
superconductors, i.e., Th4H15-Th4D15, PdHx, H3S and LaH10 (in this list we do
not include NbTiHx, PtHx, SiH4, and PH3 for which experimental data beyond Tc
are unknown), lie in same band as all unconventional superconductors,
particularly heavy fermions, fullerenes, pnictides, and cuprates, and former
should be classified as a new class of unconventional superconductors.
