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In this work, we demonstrate field-induced Bose-Einstein condensation (BEC)in the organic compound NiCl$_2$-4SC(NH$_2$)$_2$ using AC susceptibilitymeasurements down to 1 mK. The Ni $\textsl{S}$=1 spins exhibit 3D $\mathit{XY}$antiferromagnetism between a lower critical field $H_{c1} \sim$ 2 T and a uppercritical field $H_{c2} \sim$ 12 T. The results show a power-law temperaturedependence of the phase transition line $H_{c1} (T) -H_{c1} (0) = aT^{\alpha}$with $\alpha =$ 1.47$\pm$0.10 and $H_{c1} (0) = 2.053$ T, consistent with the3D Bose-Einstein Condensation universality class. An abnormal change was foundin the phase boundary near $H_{c2}$ at approximately 150 mK.

A direct measurement of the Bose-Einstein Condensation universality class in NiCl$_2$-4SC(NH$_2$)$_2$ at ultra-low temperatures