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Specific heat, $C_B$, of a TbAl$_3$(BO$_3$)$_4$ crystal was studied for 50 mK$<T<$ 300 K, with emphasis on $T<1$ K, where a phase transition was found at$T_c =0.68$ K. Nuclear, non-phonon ($C_m$), and lattice contributions to $C_B$were separated. Lowering of $T_c$ with ncrease of magnetic field parallel tothe easy magnetization axis, $B_{||}$, was found. It was established that $C_m$and a Gr\"uneisen ratio depend on $B_{||}$ and $T$ in a way characteristic ofsystems, in which a classical transition is driven by quantum fluctuations, QF,to a quantum critical point at $T=0$, by tuning a control parameter ($B_{||}$).The $B_{||} - T$ phase diagram was constructed and the dynamical criticalexponent $0.82 \le z \le 0.96$ was assessed. Nature of the transition was notestablished explicitly. Magnetization studies point at the ferromagneticordering of Tb$^{3+}$ magnetic moments, however, lowering of $T_c$ withincrease in $B_{||}$ is opposite to the classical behavior. Hence, a dominantrole of QF was supposed.

Quantum versus classical nature of a low-temperature magnetic phase transition in TbAl$_3$(BO$_3$)$_4$