The emergence of near-ambient temperature superconductivity under pressure in metal hydride systems has motivated a desire to further understand such remarkable properties, specifically critical magnetic fields. ${\mathrm{YH}}_6$ is suggested to be a departure from conventional superconductivity, due to apparent anomalous behavior. Using density functional calculations in conjunction with Migdal-Eliashberg theory we show that in ${\mathrm{YH}}_6$ the critical temperature and the isotope effect under pressure, as well as the high critical fields, are consistent with strong-coupling conventional superconductivity, a property anticipated to extend to other related systems. Furthermore, strong-coupling corrections occur to the expected BCS values for the isotope effect coefficient $\left(\alpha \right)$, Ginzburg-Landau parameter $\left[{\kappa }_1\left(T\right)\right]$, London penetration depth $\left[{\lambda }_L\left(T\right)\right]$, electromagnetic coherence length $\left[\xi \right(T\left)\right]$, and the energy gap $\left({\mathrm{\Delta }}_0\right)$.

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• Coherence length
• Critical field
• Electron-phonon coupling
• Isotope effect
• Methods in superconductivity
• Penetration depth
• Pressure effects
• Superconducting phase transition
• Hydrides
• BCS theory
• Density functional theory
• Eliashberg theory