  Thermodynamic parameters of the $\rm LaH_{10}$ superconductor were an object
of our interest. $\rm LaH_{10}$ is characterised by the highest experimentally
observed value of the critical temperature: $T^{a}_{C}=215$~K ($p_{a}=150$~GPa)
and $T^{b}_{C}=260$~K ($p_{b}=190$~GPa). It belongs to the group of
superconductors with a~strong electron--phonon coupling ($\lambda_{a}\sim 2.2$
and $\lambda_{b}\sim 2.8$). We calculated thermodynamical parameters of this
superconductor and found that the values of the order parameter, the
thermodynamic critical field, and the specific heat differ significantly from
the values predicted by the conventional BCS theory. Due to the specific
structure of the Eliashberg function for the hydrogenated compounds, the
qualitative analysis suggests that the superconductors of the ${\rm
La_{\delta}X_{1-\delta}H_{10}}$--type (LaXH--type) structure, where ${\rm
X}\in\{{\rm Sc},{\rm Y}\}$, would exhibit significantly higher critical
temperature than $T_{C}$ obtained for $\rm LaH_{10}$. In the case of LaScH we
came to the following assessments: $T^{a}_{C}\in\left<220,267\right>$~K and
$T^{b}_{C}\in\left<263,294\right>$~K, while the results for LaYH were:
$T^{a}_{C}\in\left<218,247\right>$~K and $T^{b}_{C}\in\left<261,274\right>$~K.
