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$S$ = 1/2 Ising kagome antiferromagnets (KAFs) are rare in reality. In thiswork, we report the magnetic ground state and field-induced transitions of an$S$ = 1/2 Ising antiferromagnet with a stacked kagome geometry,Na$_5$Co$_{15.5}$Te$_6$O$_{36}$. Upon cooling, magnetic susceptibilitymeasurement reveals three successive magnetic transitions at $T_1$ = 45.2 K,$T_2$ = 35.4 K, and $T_3 \sim$ 20 K. When the magnetic field is applied alongthe Ising $c$ axis, a strikingly anomalous initial magnetization lying outsidethe hysteresis loop is observed below $T_3$. Through the detailedcharacterizations, the magnetic field $vs$ temperature phase diagram isestablished. A partially disordered antiferromagnetic state is proposed below$T_1$, which becomes frozen below $T_3$. Na$_5$Co$_{15.5}$Te$_6$O$_{36}$ istherefore a promising candidate for $S$ = 1/2 Ising KAFs, and this uniquecomposite structure may shed light on the exploratory path for $S$ = 1/2 IsingKAFs.

Na$_5$Co$_{15.5}$Te$_6$O$_{36}$: an $S$ = 1/2 stacked Ising kagome antiferromagnet with a partially disordered ground state